Mark Elbroch

Mountain Lion Dispersal

M80 and F96, young mountain lions followed by Panthera’s Teton Cougar Project, dispersed from their mother’s home range in northwest Wyoming, about April 1st, 2014, when the pair were 19 months old. In northern climates, there is a Spring pulse ...

A Fortress For Cougar Kittens

We suspected F47, an adult female mountain lion followed by Panthera’s Teton Cougar Project, was pregnant in Spring of 2013; during the winter, we had caught her on camera consorting with M85, the resident male that overlapped her territory (see ...

Mountain Lions Versus Porcupines

What did F99, a subadult female mountain lion followed by Panthera’s Teton Cougar Project, think when she encountered a North American porcupine in early November? A small, female mountain lion in the Northern Rocky Mountains might weigh 80 lbs, while ...

Mountain Lions Versus Black Bears

F96, nicknamed Frostbite because of the loss of parts of her ears and the tip of her tail during the winter of 2012-13, is a young female mountain lion followed as part of Panthera’s Teton Cougar Project. She dispersed ...

Fumbling Cougar Kittens: Learning to Hunt

We recently captured F99, a now 1-year old, orphaned, female cougar kitten followed by Panthera’s Teton Cougar Project (see post Why Adult Cougars Kill Each Other? for how she was orphaned and Orphaned Cougar Kittens and Their Inspiring Will ...

Why Do Adult Cougars Kill Each Other?

F51, an adult female mountain lion currently tracked by Panthera’s Teton Cougar Project, meandered towards the eastern edge of her range, her two female offspring bouncing like electrons in orbit around her. Who can say what a mountain lion ...

Frozen Food: Winter Woes for Cougars

It was dark, and cold. Under cover of night, F61, an adult female mountain lion currently followed by Panthera’s Teton Cougar Project, padded softly back to her kill. Drew Rush, on assignment for National Geographic’s article “Ghost Cats” ...

Frozen Food: Winter Woes for Cougars

It was dark, and cold. Under cover of night, F61, an adult female mountain lion currently followed by Panthera’s Teton Cougar Project, padded softly back to her kill. Drew Rush, on assignment for National Geographic’s article “Ghost Cats” ...

Rare Video Footage Shows the Dynamics of Cougar Courtship

How cougars find each other in a vast landscape of mountains, raging water, thick forests, and rocky bluffs is one of life’s great mysteries for those of us who study mountain lions. I’ve spent many long hours contemplating ...

Rare Video Footage Shows the Dynamics of Cougar Courtship

How cougars find each other in a vast landscape of mountains, raging water, thick forests, and rocky bluffs is one of life’s great mysteries for those of us who study mountain lions. I’ve spent many long hours contemplating ...

Fecundity and Cougar Kittens

F51, an adult female mountain lion currently followed by Panthera’s Teton Cougar Project, has given birth to three litters in three years, which as far as we know, is something of an anomaly. F51 immigrated into our study area ...

Fecundity and Cougar Kittens

F51, an adult female mountain lion currently followed by Panthera’s Teton Cougar Project, has given birth to three litters in three years, which as far as we know, is something of an anomaly. F51 immigrated into our study area ...

Elk, It’s What’s for Dinner… In Winter

It’s akin to a light switch; it’s that stark. One day mountain lions inhabiting the Southern Yellowstone Ecosystem are predominantly killing mule deer, and the next day they all switch to killing elk. And then they kill elk ...

Elk, It’s What’s for Dinner… In Winter

It’s akin to a light switch; it’s that stark. One day mountain lions inhabiting the Southern Yellowstone Ecosystem are predominantly killing mule deer, and the next day they all switch to killing elk. And then they kill elk ...