David Herlocker

David Herlocker is the interpretive naturalist for the Marin County Open Space District. He leads walks all over Marin County throughout the year.

A Bird in the Hole


Imagine raising your kids on a precarious bunch of sticks on a tree branch. Some birds had the same thought: Yikes! These cavity-nesters take shelter by excavating nest holes in trees, or by using existing holes–in trees, cliffs, buildings, bridges, tractors…

At Home Under the Log


A world awaits discovery under almost any humble log in winter, whether it’s in your backyard or deep in the woods. Lift that log and make some new discoveries. Just be sure to put that log back carefully…