Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
1959
Progne subis
May 23 Tilden Park, Berkeley Hills
Male seen over ridge along east
boundary of park, NW of Inspiration
Point; cycling overhead and generally
moving northward; uttered liquid
gurgle note, leaving no doubt as to
its identity.