Ecosystems Archives - Urban Edge Wildlife Wed, 01 Oct 2025 21:55:04 +0000 en-US hourly 1 https://urbanedgewildlife.org/wp-content/uploads/2022/03/favicon.jpg Ecosystems Archives - Urban Edge Wildlife 32 32 Living with Mountain Lions in a Bay Area Canyon https://urbanedgewildlife.org/mountain-lions-bay-area/ https://urbanedgewildlife.org/mountain-lions-bay-area/#comments Tue, 23 Sep 2025 11:50:08 +0000 https://urbanedgewildlife.org/?p=5098 It’s been at least a couple of years since any mountain lions were filmed in our little 88-acre canyon in the bay area. The most recent puma was caught on camera in July as she checked the air for scent. This first video of her is dramatic, it isn’t a typical mountain lion walk-by video. […]

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It’s been at least a couple of years since any mountain lions were filmed in our little 88-acre canyon in the bay area. The most recent puma was caught on camera in July as she checked the air for scent. This first video of her is dramatic, it isn’t a typical mountain lion walk-by video. The profile of her head fills the frame. The puma is only a few inches from the camera; so close that you can hear her breathing and count her whiskers.

The Bay Area canyon mountain lion and people

She’s a cautious mountain lion. She wants nothing to do with people and does whatever is necessary to avoid them. She travels through the canyon on the wildlife and hiking trails during those times when she is less likely to encounter people. At the first hint of a human, she quietly disappears into the brush. She knows when there are people nearby because they’re loud, not just vocally but in other ways. They walk heavy, the ground creaks and rattles under their feet, grasses crunch. People aren’t subtle on the trails. Although pumas avoid humans, there are exceptions. Females can be belligerent when accompanied by cubs. Like all species, maternal instinct kicks in. Another exception is when a mountain lion feels cornered.

Many wild animals, including the canyon mountain lion, venture out between dusk to dawn to find food and other resources, times when human activity is minimal. The presence of people alters the dynamics between predators and prey, changes feeding behaviors1, 2 and the locations for hunting, foraging and sheltering. Although some species, including mountain lions and bobcats, are naturally nocturnal and/or crepuscular3, studies are showing that wild animals are shifting their activities from day to night to avoid humans4. People should be mindful and time-share the canyon and other natural spaces with the wild residents, only enjoying them during the day. The night belongs to wildlife. Don’t visit the canyon at night, instead walk on the street in the evenings and at night. The street runs parallel to the canyon and is less than four hundred yards away.

Our canyon mountain lion runs from a person

On the night of August 23rd, in our bay area canyon, the mountain lion avoided an encounter with a walker who stumbled up the trail. Most likely, he had no idea that he was right behind the mountain lion, heading in the same direction. The time stamp on the first video shows the puma rushing up the trail at 8:39 PM. A few seconds later, at 8:40 PM, the walker is captured on film following closely behind her.

The time stamp on the first video shows the puma rushing up the trail at 8:39 PM.

A few seconds later, at 8:40 PM, the walker is captured on film following closely behind her.

Mountain lions follow their prey

Mountain lions follow their food and their favorite meal is venison. The canyon is currently hosting a substantial number of deer. There is plenty of vegetation, water, and cover for them. Until recently, it’s been a relatively safe haven for the does and their fawns. Before the puma showed up in July, the only predators that raised concern were a pair of coyotes who are regulars in the canyon.

A mountain lion will kill and eat approximately one deer a week. Our canyon lion, like all pumas, doesn’t eat the whole thing in one sitting. She first drags the carcass somewhere nearby and then caches it; covering it with forest detritus to protect it from scavengers and reduce spoilage. Depending on the size of the prey and other environmental factors, it can take her between 2-5 days to consume it. Being a typical mountain lion, she’ll stay nearby, unless frightened away, until the carcass is eaten or spoiled. She isn’t the only one who benefits from her hunting prowess. When she’s away from the carcass, other animals have a chance to grab a quick bite—coyotes, raptors, skunks, and other wildlife benefit from the puma’s successful hunt.

On August 22nd, our bay area canyon mountain lion stalked and ambushed a fawn, one of two who was birthed by a lame, resident doe. Although sad to see, the death of that one fawn is ecologically significant. That fawn died so that others can live and thrive. Her death was not in vain—it contributed to keeping the eco-system balanced and healthy. She fed the community.

The delicate balance of the ecosystem

The presence of the mountain lion in the bay area canyon serves as a powerful reminder of the delicate balance between wildlife and human activity. Our puma plays a crucial role in maintaining the health of the canyon ecosystem. By regulating the deer population, she helps prevent overgrazing, reduces disease transmission (including Lyme disease), and provides sustenance for other wildlife. Additionally, because she is an opportunistic hunter she hunts smaller prey including rats.

By being mindful of our impact on the environment and sharing these spaces responsibly with wildlife and bay area mountain lions, we can help maintain the health of the ecosystem and its wild residents. The canyon, with its rich ecosystem, offers a sanctuary for many species, and it is our duty to protect and preserve it. One small way we can help the ecosystem is to enjoy the canyon only during the day—don’t go there at night. The night belongs to the wild ones. Enjoy the canyon and other open spaces during the day and leave the night to its rightful inhabitants.

  1. Justine A. Smith , Justin P. Suraci1, Michael Clinchy, Ayana Crawford, Devin Roberts, Liana Y. Zanette, and Christopher C. Wilmers. Fear of the human ‘super predator’ reduces feeding time in large carnivores. September 14, 2025.
  2. Veronica Yovovich, Meredith Thomsen, Christopher C. Wilmers. Pumas’ fear of humans precipitates changes in plant architecture January 1, 2021. Ecosphere www.esajournals.org 1 v Volume 12(1) v Article e03309
  3. Crepuscular: Crepuscular animals are the most active during dawn and dusk.
  4. Kaitlyn M. Gaynor, Cheryl E. Hojnowski, Neil H. Carter, and Justin S. Brashares. The influence of human disturbance on wildlife nocturnality Jun 2018 Vol 360, Issue 6394 pp. 1232-1235

Marilyn is a certified cat behavior consultant (The Cat Coach, LLC). Not surprisingly, she’s fascinated by feline behavior. This started with household cats and then after witnessing a puma being killed four blocks from her home in the suburbs, expanded to include local bay area mountain lions and bobcats. A few years after the tragedy, she joined the Bay Area Puma Project/Felidae Conservation Fund, maintaining trail cameras, writing and helping wherever she can. Her focus is on how urbanization is affecting apex predators’ behaviors.

She is also an author and educator. Her book Naughty No More! focuses on solving cat behavior issues through clicker training, environmental changes as well as other positive reinforcement techniques. She gives presentations throughout the United States as well as writes columns and articles for a variety of venues.

Join Marilyn for lively discussions about all things feline on her Facebook pages: The Cat Coach and Urbanedge Wildlife

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You Can Make a Difference https://urbanedgewildlife.org/you-can-make-a-difference/ https://urbanedgewildlife.org/you-can-make-a-difference/#comments Mon, 17 Jul 2023 12:46:40 +0000 https://urbanedgewildlife.org/?p=4405 Can we make a difference? Faced with the serious and urgent threat of global climate change, it may seem that there is little that we can do to stop the trajectory of Earth into a bleak future. Although it may seem impossible for us as individuals to reverse this destructive trend, each of us can […]

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Can we make a difference? Faced with the serious and urgent threat of global climate change, it may seem that there is little that we can do to stop the trajectory of Earth into a bleak future. Although it may seem impossible for us as individuals to reverse this destructive trend, each of us can choose to do activities that are beneficial for the environment and will help heal Earth. We start by not ignoring the symptoms of our ailing planet and we make choices and engage in actions that benefit and help preserve the ecosystem. We don’t have to go far to make a difference. It begins in our homes, backyards and neighborhoods.

Future conservationists learning about the eco system. Children can make a difference

Future conservationists learning about the ecosystem

Simple activities that make a difference

Ecocentric activities can take a little or a lot of work. Some, such as not disturbing wildlife, not moving rocks (they may be sheltering someone) and staying on trails are passive activities. Others, including picking up trash (even if it isn’t yours), leashing dogs, removing their excrement and planting gardens to attract pollinators take more effort.

Pick a Flower and Trouble a Star

Everyone must be mindful of the effects that individual and collective actions have on the environment. The consequences of our actions ripple through the ecosystem. Even the seemingly innocent act of turning over a stone in a river can have devastating consequences and hasten the extinction of an endangered species1

Larger projects carried out in open spaces including clearing trails and installing barbed wire fences and barriers across wildlife paths and corridors can fragment habitats, separate animal families and block food sources.

Buck with his antlers entangled in a new fence

A new fence blocks a wildlife pathway.

A shoutout to the children

The 88-acre canyon that I love and write about, hosts a diversity of wildlife. Although a small habitat, it’s an important one. This wild space is part of a network of other natural areas, separated from each other by roads and buildings. The little canyon is also a popular hiking spot for the locals. It’s a perfect place to see how people’s activities impact the fragile environment.

There’s a wonderful eco-minded pre-school at the head of one of the trails that leads into the canyon. A few years ago, the young students started calling themselves The Jell-O Club.  The name wasn’t randomly picked. Like many preschoolers, the children were given mid-morning/mid-day snacks. After they and their eco-conscious parents noticed the plastic wrappers from their refreshments littering the canyon and floating down the creek, they asked the school’s director if they could have snacks that were in biodegradable packaging. These eco-minded youngsters didn’t stop there. They cleaned up the canyon trails, using pickers to grab up plastic, paper, metal and glass. To this day these little ones are still vigilante trail custodians. They are more than trail custodians; they are young conservationists in training, and they help keep the wildlife, dogs and hikers safe from the hazards of garbage and glass. The earth needs young vigilante conservationists like the Jell-O Club. They are making a difference.

Destruction of a shelter close to home

Until a few months ago, wildlife kept dry by crossing the canyon creek on a natural bridge made from branches intertwined between rocks, roots and the trunk of a large bay tree. The tangle of branches and leaves also provided shelter, cover and food for many species of wild animals. Generations of bobcats found the trunk and vegetation a safe spot to shelter and raise kittens. Although this was one of several shelters that the bobcat families used, they returned to it on a regular basis. Generations of kittens played, grew and learned essential survival skills on top of the branches and on the banks adjacent to the shelter.

Bobcats weren’t the only animals who hung out there. When the bobs weren’t around, possums would forage amongst the leaves and use the fallen branches and rocks as pathways to connect to the other side of the creek. Every night, dusky-footed woodrats, who are a species of special concern, ran over the tops of the large trunk that framed the creek. It worked well as a bridge, connecting to the bay trees where the woodrats built their large multi-generational homes.

For many years, this pile of rocks and branches played an important part in the lives of the wild residents. It supported many species for countless generations until one day a man with a shovel purposely destroyed it. It only took him one hour to eliminate it.

There were no reasons to demolish it. No human-made structures were nearby that could be impacted by the rising creek waters. Nature had successfully managed the creek for hundreds of years without this man’s help.

In addition to negatively impacting the animals, he destroyed part of a sensitive habitat that is home to species of special concern. Years ago, the county mandated that there can never be any building or modifications made in the canyon because it’s an environmentally sensitive riparian habitat. It is supposed to remain untouched.

Destruction of a wildlife crossing point and shelter

Destruction of a wildlife crossing point and shelter

It was difficult to watch the videos of wildlife discovering that their familiar crossing point and shelter was gone.

Rat poisons

For ten years, an organization near one of the trail heads hired an exterminator to bait traps with 2nd generation rodenticides. These deadly rat poisons remain in the tissues of the rats and travel up the food web. After eating the poison, the sick rodents don’t immediately die. The rats wandered into the canyon and neighboring yards and became easy targets for predators, including raptors, bobcats, pumas, coyotes as well as household dogs and cats.2

Bobcats help keep the rat population down

Bobcats help maintain a healthy ecosystem.

5 years ago, Slim, a beautiful mountain lion died after she ate a rodent that had eaten the bait. She had been frequently filmed late at night walking up the canyon trails, often hesitating at the junction where two two trails intersected.  Slim was one of many unintended victims of 2nd generation rodenticide.

One person made a difference

Because of the perseverance of one man, the organization recently stopped using the poison. He successfully convinced the organizations board of directors to stop its use and dispose of the bait traps. He presented facts and suggested alternatives to 2nd generation rodenticide for reducing the rat population.3 One person took action and made a difference.

You can make a difference

Although individually we may not be able to stop global warming, we can take actions that halt further destruction of the environment. We need to be mindful, think about the potential consequences of our actions and be aware of the ripple effect that our activities have on the ecosystem. We all need to do our parts to preserve and heal our fragile ecosystem.

  1. Hellbender, an endangered species is in danger of disappearing forever. Because it makes it home under rocks in rivers, turning over, moving rocks displaces them “Once a nest rock is moved, hellbenders won’t ever use that rock again.” Stroup said. “There’s not a whole lot of clean, pristine habitat left for hellbenders. A lot of time we were damming rivers and creating lakes, we lost a lot of that riverine habitat for aquatic species.”
  2. These rat poisons kill indiscriminately.  A study commissioned by California Department of Fish and Wildlife found 2nd generation rat poison in 85% of the mountain lions, bobcats and fishers who were tested in California  In 2020, Governor Newson signed the bill which makes it illegal to use 2nd generation rodenticides in California. Although it’s illegal, some people and businesses, including the canyon neighbor, hire exterminators, who place the lethal poison in bait boxes.
  3. Rats are a problem, but there are better, safer ways of managing and reducing the population. You can make a difference and let natures’ exterminators do their jobs. Rats are regular parts of the predator’s diet. Additionally, remove food items, pick up dog and cat food and secure garbage cans and clear away brush will also help keep rats away from homes and businesses. For more information contact the following organizations:
    The Hungry Owl Project; Raptors are the Solution; California Department of Fish and Wildlife; Rodenticides Topic Fact Sheet

Marilyn is a certified cat behavior consultant (The Cat Coach, LLC). Not surprisingly, she’s fascinated by feline behaviors. This started with household cats and then after witnessing a puma being killed a few blocks from her home in the suburbs, expanded to include local mountain lions and bobcats. A few years after the tragedy, she joined the Bay Area Puma Project/Felidae Conservation Fund, maintaining trail cameras, writing and helping wherever she can. Her focus is on how urbanization is affecting apex predators’ behaviors.

She is also an author and educator. Her book Naughty No More! focuses on solving cat behavior issues through clicker training, environmental changes as well as other positive reinforcement techniques. She gives presentations throughout the United States as well as writes columns and articles for a variety of venues.

Marilyn is interviewed on podcasts, print and on line publications. Additionally Marilyn is a frequent guest on television and radio and has appeared, along with her Bengals and Savannah Cat on Animal Planet, CBS, ABC, KGO and others.

Join Marilyn for lively discussions about all things feline on her Facebook page.

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Summertime Brings Changes to the Canyon Wildlife https://urbanedgewildlife.org/summertime-brings-changes-to-the-canyon-wildlife/ https://urbanedgewildlife.org/summertime-brings-changes-to-the-canyon-wildlife/#comments Tue, 27 Jul 2021 13:56:32 +0000 https://urbanedgewildlife.org/?p=2847 Three trail cameras continue to film wildlife and human activity in an undeveloped 88-acre canyon. This canyon is ideal for observing wildlife responses to  changes—it’s surrounded on all sides by businesses, roads and homes. For more than three years the cams have recorded how the suburban canyon wildlife reacts to the pressures of urbanization and […]

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Three trail cameras continue to film wildlife and human activity in an undeveloped 88-acre canyon. This canyon is ideal for observing wildlife responses to  changes—it’s surrounded on all sides by businesses, roads and homes. For more than three years the cams have recorded how the suburban canyon wildlife reacts to the pressures of urbanization and a shrinking habitat.

A mountain lion visits the canyon on a weekly schedule. He was first filmed months ago, patrolling the trail in the early mornings, long before the joggers, walkers and dogs are out. The main trail camera is in the perfect spot to record him hesitating at the trail junction before continuing on his way. He usually stops for only a second or two, scents the air and scans the trail for potential threats. This boy is not the only mountain lion who regularly visits the canyon. A female is also an occasional visitor. In addition to the two pumas, the canyon appears to be hosting an increasing number of wildlife.*

A surge in canyon wildlife

After months of animal absenteeism, the canyon appears to have once again become a popular wildlife hot spot. Since late spring, the memory cards are filled to capacity with vids of dusky-footed wood rats, mice, rats and rabbits—magnets for predators. There is also a noticeable increase of deer hanging out in the canyon, observable with and without trail cameras. When walking slowly and quietly, you may catch a glimpse of deer off the paths munching on the vegetation. It is not a mystery why the mountain lions are drawn to the canyon—they follow the food and venison is their top menu choice.

For close to a year the trail cameras filmed only a few wild animals. The timing of the decrease of wild animal sightings coincided with the increase of people who discovered the little suburban paradise during the pandemic. Instead of the usual canyon wildlife, the memory cards were filled with videos of people, bicyclists and hundreds of dogs, many off leash, racing through the sensitive habitats.

After a long and painful year, we are finally on the other side of the pandemic. It appears that the unfortunate trend of dwindling wildlife is slowly reversing. Although many hikers and joggers still favor the trails, the cameras are filming fewer of them. Additionally, sightings of bicycles and off-leash dogs have decreased. This shift in human activity may be one of many reasons animals are either increasing in the canyon or making more appearances.

Mountain lions

Although the two lions, a male and a female, have not been filmed together, they do seem to time share the area, walking the same trails on different days. Pumas are territorial—especially the boys who have zero tolerance policies for other males. They compete for a limited number of females and food. For obvious reasons, males are at times more accepting of girls and it is not unusual for their territories to overlap those of females.

Mountain lions, like other members of the Felidae family, communicate a broad range of information about themselves and they also delineate their territories by marking. These include scraping dirt into piles with their back paws and then urinating or defecating on them and scratching objects, such as trees and logs. Although I searched for evidence of puma territorial markers, I have not found any in the vicinities of where the cats have recently been filmed.

Mountain lions are foodies—they love venison and for the last few months there has been plenty of it in the canyon. On an average, pumas usually take down one deer a week. It is not devoured in one sitting—one deer can feed a lion for a few days. On an average, they eat about 8-10 pounds of meat a day. The carcass is cached, covered with leaves, brambles and debris. Mountain lions do not usually travel too far from the carcass, that way they can snack on it when they’re hungry. The carcass feeds more than the lion—other opportunistic scavengers and predators, such as raptors, coyotes and smaller animals benefit from successful mountain lion hunts.

Bobcat sightings

The canyon bobcats are a continual source of entertainment, especially because I recognize a few of the individual cats. During the last few years, I have sketched out the placement and shapes of the spots on their front legs.

Spots and patterns on bobcat legs--observing canyon wildlife

Patterns, placement and shapes of spots that are on the front legs of 3 different bobcats

Although, it appears that parts of the canyon are the core home ranges for at least two female bobs, a couple of males have also been filmed occasionally in the girls’ core zones. Core ranges are located inside much larger ranges. These smaller core zones include successful hunting spots, numerous shelters, water sources, and safe areas for birthing and raising kittens.

The two canyon girls might be related. When bobcats are 9-10 months old, they leave their mums to seek out their own territories. Males disperse further than females and have larger ranges which often purposely overlap the ranges of girls. Depending on available terrain and other critical necessities such as food, water, shelter and safety, the girls may stake out territories near their natal neighborhoods. Sometimes the outer reaches of their ranges are adjacent with their mums. Like most felines, bobcats live solitary lives, hunting and raising their young alone.

Bobcats don’t just hang out in their core home ranges—they patrol their whole territories. The canyon bobs often cross the dangerous road that borders one side of the canyon, accessing protected open space to hunt and possibly fraternize with the opposite sex.

At least two batches of kittens have been born, nurtured and raised in the canyon this year. Typically, litters start out with three kittens, but it is not set in stone. Unfortunately, it is rare for all to survive. Despite vigilant mums, it is a dangerous world for youngsters. Note the smallest kitten on the far right in the first video. Only one eye reflects light back into the camera. This little one may have a serious problem which may negatively impact the odds of successfully surviving into adulthood.

They are so cute bouncing down the trail.

I hope the trend the cameras are recording of an increase of wild animals in the canyon continues. Although there are many factors contributing to this latest shift in occupancies and visits, most likely it’s not a coincidence that the decrease of people, bicycles and off-leash dogs is making a major impact on the wildlife.

*You will note that the date stamp on some of the vids says the year 2020 instead of 2021. Unfortunately, one of the cameras does not display the date correctly and keeps defaulting to the wrong date.


Marilyn is a certified cat behavior consultant (The Cat Coach, LLC). Not surprisingly, she’s fascinated by feline behaviors. This started with household cats and then after witnessing a puma being killed a few blocks from her home in the suburbs, expanded to include local mountain lions and bobcats. A few years after the tragedy, she joined the Bay Area Puma Project/Felidae Conservation Fund, maintaining trail cameras, writing and helping wherever she can. She is focusing on how urbanization is affecting apex predators’ behaviors.

She is also an author and educator. Her book Naughty No More! focuses on solving cat behavior issues through clicker training, environmental changes as well as other positive reinforcement techniques. She gives presentations throughout the United States as well as writes columns and articles for a variety of venues. She is also frequently interviewed for print and on line publications. Additionally Marilyn is a frequent guest on television and radio and has appeared, along with her Bengals and Savannah Cat on Animal Planet, CBS, ABC, KGO and others.

Join Marilyn for lively discussions about all things feline on her Facebook page.

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A Snapshot of Wildlife in the Canyon: Fall of 2020 https://urbanedgewildlife.org/a-snapshot-of-wildlife-in-the-canyon-fall-of-2020/ https://urbanedgewildlife.org/a-snapshot-of-wildlife-in-the-canyon-fall-of-2020/#respond Tue, 22 Dec 2020 14:41:59 +0000 https://urbanedgewildlife.org/?p=2302 My favorite canyon is only 90 acres in size; it’s surrounded by buildings, roads and all the trappings of urbanization. Despite its tiny size and suburban location, it is rich with many species of wild animals and native plants—it is a complex, working eco-system where all the players are interconnected. Three trail cameras faithfully document […]

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My favorite canyon is only 90 acres in size; it’s surrounded by buildings, roads and all the trappings of urbanization. Despite its tiny size and suburban location, it is rich with many species of wild animals and native plants—it is a complex, working eco-system where all the players are interconnected. Three trail cameras faithfully document this inter-connectedness as well as the dramas and struggles the wildlife in the canyon encounter every day.

Two bucks fighting--wildlife in the canyon

Two mature males fighting–it’s rutting season

During the months of September, October and November, the cameras recorded enough wildlife activity to see the effects that natural and manmade events have on the canyon eco-system. Devastating wildfires, drought, dogs running through sensitive and vulnerable habitats, poisons, apex predator changes and the season greatly impacted all the canyon residents.

Mountain lion

Mountain lions aren’t new visitors to the canyon. The cameras have filmed puma activity here since they were set up three years ago. Until recently, pumas were recorded walking the trails and occasionally marking about every three months. The canyon has probably always attracted them because of the abundance of their favorite food—deer.

The first mountain lion I wrote about was “Slim”, she died after she ingested second-generation rodenticide. After her death, other lions occasionally ventured into the canyon. That changed in August when the devastating wildfires drove the animals to seek safety from the deadly smoke and flames. Many found sanctuary in the canyon and by necessity, had to share the 90 acres with the already established residents. Last August, one male puma found the canyon an ideal spot to hang out for a few months—there was an abundance of deer as well as places to shelter. Since 90 acres is too small of an area for a mountain lion, he’d travel outside the canyon into the neighborhood late nights and early mornings. On November 25th, his regular appearances stopped.

I received a text late on Thanksgiving evening. It was a short text, stating that there was a dead mountain lion on Interstate 280, not too far from the canyon. We searched the freeway for hours without finding the carcass.  At first light the next day, I continued the search, walking the area, looking in the underbrush, but with no luck. It’s possible that the body was picked up by CalTrans the day before. Sadly, since Thanksgiving, none of my trail cams or the neighborhood security cameras have filmed the canyon mountain lion on his usual patrols. Although, I’m holding out hope that I’ll see him again, the odds are that his life was prematurely cut short on Thanksgiving Eve. Tragically many of our beautiful mountain lions along with other extraordinary wild animals lose their lives on the highways.

Bobcats

The trail cameras are usually packed with videos featuring bobcats. I’ve learned to recognize individuals from the unique patterns of spots on their legs. Earlier this year, a young resident female, who was born in 2018, had three kittens. This may have been her first litter, only one kitten survived. The other two may have fallen victim to other predators, vehicles or second-generation rodenticides. Kittens are vulnerable.

Bobcats, like most felids, live alone, hobnobbing with other bobs in only a few circumstances. Not surprisingly, when females are in estrus they hang out with the future fathers of their kittens. Bobcat moms have difficult jobs. They must keep their kittens safe, provide food for them as well as teach them important survival skills necessary for living in a dangerous world. It’s hard work and the mums have to do it alone. The little families usually stay together about 9-12 months, then the adolescents disperse, leaving mum’s protection to look for their own territories. Often when kittens disperse, siblings stick together for awhile, than finally go their separate ways.

The resident bobcat in the following video knows she’s not alone. Check out how she is walking and glancing to the left. Look at her tail, especially when she starts to crouch down. At the end of the video there is a second bobcat that appears at the upper left of the screen. I’m fairly certain that this is an admirer.

Deer dramas

The canyon has always been full of deer –there is an abundance of vegetation to munch on as well as a creek to drink from. Although the deer attract coyotes and mountain lions, it’s worth the risk for food.

Fall is usually a dramatic time for deer, especially for mature males. It’s rutting season; bucks have an increase in testosterone and the does may come into estrus. Mature males are amorous and challenge other competing males for the affections of the does. One of the cameras was in the right place at the right moment and filmed a violent encounter between two bucks and boy did they get into a rumble. It’s rare to catch such extraordinary action.

Bucks don’t fool around—these are violent fights that often result in injuries that can end in death. One of the bucks sustained a serious injury to his side. I hope he survives.

Disappearance of Coyote 09M and his pack

The presence as well as the absence of apex predators influences all of the resident and transient wildlife. It’s not a coincidence that when the canyon cams repeatedly film mountain lions, they don’t film coyotes. Most likely, not wanting to confront a puma, the coyotes moved outside the 90 acres favoring a safer, open space. Soon after the male puma started favoring the canyon, Coyote 09M, his mate and puppies disappeared. I hope they are safe.

Although 09M has not been seen, we filmed a fascinating sequence of a coyote hunting an underground rodent not too far from the canyon. Coyotes are amazing. Their hearing is so acute they can hear rodents scampering and squeaking in their tunnels deep underground. The first video shows the coyote hearing the rodents—note how he turns his head to listen.

After the coyote is certain that there is a possible meal under his feet he starts digging. The whole sequence is about three minutes long. Hunts aren’t always successful—he didn’t catch a rodent this time.

More wildlife in the canyon

Since 09M and his pack have moved out of the canyon, other animals are either moving in or feeling bold and venturing out more. Foxes are now running up the trail almost every night. Check out that tail!

There is always an abundance of squirrels, but this poor squirrel is furless. He might be suffering with notoedric mange or inflicted with a genetic condition or perhaps he has a fungal infection. He seems to have fur only on his tail. We also have videos of a squirrel with fur on his body but not on his tail.

Thank the Dusky-footed Woodrat for the preservation of the canyon. Because of them, there can be no development here. These precious animals are listed as a California Subspecies of Special Concern. And, they really are special. After 09M claimed the canyon they were rarely seen. Although bobcats and foxes also dine on them, since the coyotes have vacated the canyon, the woodrats are frequently being filmed.

The cameras show how busy this little canyon is. Every day people walk and jog on the narrow trail that follows the creek through the center of the canyon. Although they enjoy spending time in this small natural space, most of the people are unaware of the rich drama that is continually unfolding around them—how can they know? The wildlife in the canyon instinctually adjusts schedules and routes in order to avoid humans. Because of the images from the cameras we can see some of the dramas and the impact of natural and human-made events on the sensitive eco-system.


Marilyn is a certified cat behavior consultant (The Cat Coach, LLC). Not surprisingly, she’s fascinated by feline behaviors. This started with household cats and then after witnessing a puma being killed a few blocks from her home in the suburbs, expanded to include local mountain lions and bobcats. A few years after the tragedy, she joined the Bay Area Puma Project/Felidae Conservation Fund, maintaining trail cameras, writing and helping wherever she can, while learning how urbanization is affecting the apex predators’ behaviors.

She is also an author and educator. Her book Naughty No More! focuses on solving cat behavior issues through clicker training, environmental changes as well as other positive reinforcement techniques. She gives presentations throughout the United States as well as writes columns and articles for a variety of venues. She is also frequently interviewed for print and on line publications. Additionally Marilyn is a frequent guest on television and radio and has appeared, along with her Bengals and Savannah Cat on Animal Planet, CBS, ABC, KGO and others.

Join Marilyn for lively discussions about all things feline on her Facebook page.

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