N A SUNNY November morning, Anthony Colegrove parked his work truck on the side of a road in northern California’s Klamath Mountains and began creating a mobile laboratory. He pulled down the truck’s tailgate, popped open a tackle box filled with syringes and other supplies, and pulled out a clipboard. Meanwhile, a weasel-like animal called a fisher waited nearby, making glottal noises inside a wire trap.

Colegrove is a field technician with the Hoopa Valley Tribe’s wildlife division. He and a colleague, Holly Horan, coaxed the squirming fisher out of the trap and into a metal cone that restrained the mammal while Colegrove injected a sedative into its rump.

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