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 behaviors^{1, 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 23^rd, 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 22^nd, 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

The post Living with Mountain Lions in a Bay Area Canyon appeared first on Urban Edge Wildlife.

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.

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

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 2^nd 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 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 2^nd 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 2^nd 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 2^nd 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 2^nd 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.

The post You Can Make a Difference appeared first on Urban Edge Wildlife.

It’s always a delight to review the memory cards. Sometimes all we see are people, dogs and deer, other days, we are treated to videos of bobcats, the occasional mountain lion, coyotes and dusky footed woodrats.

During the last 10 days, bobcat kittens, rabbits and deer were the trail cams urban wildlife stars. The largest predators that were recorded were adult bobcats. Mountain lions, coyotes and foxes did not venture in front of the cameras.

Bobcat kitten

A bobcat kitten was repeatedly filmed bopping up and down the trail for a couple of days. The little one was not accompanied by mum or siblings—perhaps he was separated from his family. I hope that this baby eventually reunited with his mum. He’s too young and vulnerable to be out alone.

The next day he’s filmed again, but this time heading in the opposite direction on the trail. There are five more videos of this sweet baby alone.

Something startled this youngster. He might be the same little solitary bobcat kitten from a few days ago, but the ruff around his face seems more prominent than the kitten’s. This little one is so frightened, he momentarily freezes in place, then hurries away, keeping as low to the ground as possible, trying not to be seen. No possible threats were recorded before or after.

More bobcats

This gorgeous bobcat is frequently filmed near the creek. Check out the stripes on the inside of his back legs.

Deer

Deer are frequent visitors, often whole families show up, looking for vegetation to munch on.

Possum

These prehistoric looking marsupials fill an important niche in the eco-system. They are cleanup crews, eating an assortment of stuff, dead and alive, including garbage, snails and mice. Thank them—they also eat ticks. Unfortunately, the cams haven’t filmed any possums with babies riding on their backs.

Rabbit

There is at least one rabbit who lives at the fork in the trail. It’s amazing he hasn’t caught the eye of the resident predators. Rabbits are part of the diets of bobcats, coyotes and raptors. Usually he’s filmed at night, seldom during the day. I am rooting for his continual survival.

Protect the urban wildlife

Thank you to those of you who appreciate wildlife and understand the importance of keeping your dogs on leashes, not allowing them to run through the fragile habitats. You set a good example.

The cameras give us small windows for viewing the fragile eco-system. They let us glimpse vignettes of canyon wildlife and how it’s impacted by humans as well as natural events.

Marilyn is a certified cat behavior consultant. 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.

The post A Ten day Glimpse of Urban Wildlife in the Canyon appeared first on Urban Edge Wildlife.

I created a spreadsheet, comparing videos from one camera during the same 13-day period in 2019 with those from the same dates in 2021. The data tells the story, and it is not good. It’s a tragedy to see the canyon trails, once a paradise vibrant with a diversity of wild animals, changed into a ghost town.

It probably isn’t a coincidence that at the same time there’s been a dramatic decrease in wild animals, there is a substantial increase of people, bicyclists and off-leash dogs that are racing through the sensitive habitats. People’s response to Covid19 is most likely behind this upsurge of activity. Comparing the footage from the 13 days in 2019 to the same period in 2021, it’s noted that in 2019 there was only one dog off leash, 18 walkers and one bicyclist filmed in the canyon. It’s a different story in 2021. During the same period, 62 dogs ran off-leash, 499 people walked the trail and there were 33 bicyclists. Most likely, the consequences from the increased usage, especially from the dogs who are allowed off-leash is significant enough that many animal residents have vacated. Unfortunately, Coyote 09M, his mate and pups have disappeared. The last puma was filmed in November and the last coyote was recorded in October 2020. And during the recent 13-day period only a couple of bobcats, one deer and a few skunks were filmed.

Comparison of number of people for same 13 day period in 2019 and 2021–18 people in 2019, compared to 499 in 2021. See spread sheet

Dogs and people

Many of the people who are accompanied by their four-footed companions are responsible dog people. Their dogs are leashed, and their excrement is bagged and removed. As a rule, they control their dogs and don’t let them run off the trail. Thank you for being mindful and doing your part in preserving the canyon and attempting to keep it safe for its wild inhabitants.

Unfortunately, most of the dogs are uncontrolled and race off the trails. All of these dogs have people trailing a distance behind them. During the 13-day study period in 2021, 62 dogs were filmed running off-leash while only 40 sported leashes. The off-leash dogs tore through the canyon, chasing deer and other wildlife and destroying dusky-footed woodrat homes.

Dogs running off leash comparison for same 13 day period in 2019 and 2021. 1 dog ran off leash in 2019, 62 in 2021. See spread sheet.

The dusky-footed woodrat has been designated a species of special concern. This special mammal lives in the canyon and is the main reason that the canyon is not allowed to be developed. Their homes can be 60 to 70 years old—and up to 6 feet high.

Dusky-footed woodrat home

Although it took years for dusky-footed woodrats to construct this home, it probably took less than a minute for it to be destroyed.

Destroyed Dusky Footed Wood Rat home

The wild animals have left

The increase of people and uncontrolled dogs may not be the whole story—there might be other factors that also contribute to the wild animals vacating the area. Although correlation does not imply causation, based on the comparison of videos from the same time periods for the two years as well as the reports from other nature preserves and parks, the upsurge of people, off-leash dogs and bicyclists are most likely the primary reason for the wild animals to now avoid the trail.

Wildlife sightings comparison for same 13 day period in 2019 and 2021. 46 Wild animals were filmed in 2019, 18 in 2021.See spread sheet

I realize that people want to see me post videos of the latest wildlife that uses the trails. I can’t post any for you simply because there aren’t any. Although the wild animals are conspicuously absent from around the canyon trail, every week we have hundreds of new videos that are populated only with people, dogs and bicyclists. The cams are purposely aimed at an angle to avoid recording faces—we do see legs, knees and shoes. And the cams regularly film people engaged in a range of mostly healthy activities including walking, running, exercising, singing and dancing. Sometimes unexplained events are also filmed such as these people carrying shovels. I hope they are using those shovels to fill in the areas on the trail that now have erosion issues and that they aren’t removing native plants. And why move the stick?

Thousands of videos filmed in the canyon since 2018 chronicle the usual seasonal cycles of the wildlife. Unfortunately, they’ve also recorded a huge decrease of wild animals on the trail. Based on the data comparisons from the two years, it appears that the consequence of increasing human activities, especially dogs running loose into the fragile habitats has driven the wild animals to abandon the areas around our canyon trails.

*San Francisco dusky-footed woodrat, California red-legged frog, pallid, bat, potential nesting grounds for coopers hawk, white-tailed kite and yellow warbler from EIR Report, December 2008 Impact Science, Inc

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 online 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.

The post Where are the Wild Animals? appeared first on Urban Edge Wildlife.