Deep in the forests of Mount Rainier National Park, a female fisher holes up in the crook of a towering Douglas fir, protecting and feeding her newborn kits. Far below and several miles away, a propeller spins faster and faster, generating the speed needed to hurl a small aircraft down an airstrip and into the Northwest skies. The plane’s belly and wings bristle with antennae as it heads off on a mission to pinpoint the fisher’s location using signals from a transmitter implanted before her release. This is a fisher reconnaissance mission, funded with the donations made by Northwest Trek …