Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Remsen,
J.V.
1977
Cliff Swallow
Petrochelidon pyrrhonota
Nov. 23 Furnace Creell Ranch, Inyo Co., Calif: I watched for 10
minutes as we studied it carefully to make sure it was
not a Cave Swallow. An extremely late date for anywhere
in North America