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    Puma Tracker

    Over the last 20 years animal movement data has become one of the primary tools in managing and conserving wildlife. Its helping scientists better understand the ecology of everything from albatross and bluefin tuna in the oceans to antelope and cheetahs on land. But how often does the non-scientist actually get to see and play […]

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    Capturing a Mountain Lion

    We’ve made a video of the mountain lion capture process explaining everything from looking for tracks to capturing and collaring the mountain lions themselves. If you’ve never seen redwoods glistening in the sunlight, or hound dogs picking up a fresh scent, or a mountain lion descending from over 40 feet up in a tree, then […]

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    High-Tech Collars

    Wildlife tracking devices have come a long way since the 1960’s. Back then scientists attached balloons to the backs of seals so they could follow them around the ocean by boat. Today GPS tags allow you do get dozens of locations a day on your study animals without leaving the comfort of your office (except […]

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    Habitat Fragmentation

    Habitat fragmentation is among the top threats to wildlife worldwide. Think about it. Just about everywhere you go in the world today, there are roads, houses and/or farms. For some species like coyotes, deer and raccoons, this is a great thing. But for other species like elephants, wolves and tigers it can spell doom. Here […]

Sunrise from Mt Umhunum.  Fog in the Santa Clara Valley, and the lights of New Almaden below.

66M: The Early Bird Gets The Puma

My day started early today in the Sierra Azul Open Space Preserve. I had been out since 5:30am searching for puma 26M in order to locate him for recapture. My plan was to start early and search for the radio signal from his tracking collar, and if I found him on property we had permission […]

Three week old cub of puma 38F.  Photographed in July 2013.

38F: Catching a Thief

We recaptured puma 38F last week.  She’s a 4 year old female. 38F’s previous claim to fame was being the star of a great web video that was produced by San Francisco’s KQED and the eventual mother of this cute little guy… Using radio-telemetry collars, like we do on this project, requires that we periodically […]

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RIP 36m – Genomics godfather to all pumas!

Remember 36m?  This is the guy whose home range included the UCSC campus and went all the way up north close to Big Basin! One day he even decided to make a kill within view of the front steps of my office building.  Not sure who was stalking who :-). 36m also had a penchant […]


2 week-old kittens

This is a pair of 2 week old puma kittens. We make our initial visit to dens at 2 weeks in order to confirm it is a den and count how many kittens were born. We return at 4 weeks to place collars on kittens in order to track their growth and survival. Our published […]