Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Remsen,
J.V.
1975
Black-backed Three-toed Woodpecker
Picoides arcticus
Sep. 19 Yosemite Creek Campg., Yosemite NP, Tuolumne Co., Calif.: 1♀ foraging quietly on fir tree trunk, knocking off chips of bark by pounding at an angle to the surface instead of perpendicularly.