Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
J. Broth
1990
field notes
248.
Animal Behavior Station, University of California, Berkeley,
Dec 13 and other miscellaneous calls. some type 2 wild crossbills
(cont'd) flew around the station on a few occasions, but captives
did not respond, except ♀771 called at was not recorded.
Dec 14 I tried to record "59" plus birds in his cell: 769 and 772.
Also I brought out three new males from the cell
of birds 425 and 306; they were numbered 773,
774, and 775. 773 had the left-crossing bill.
773 and 774 were recorded in "breed's" of song, also in
loud, Type 1-sounding flight calls. 775 did not call.
769 and 772 gave only a few, Type 2-sounding calls.
"59" also was recorded in flight and alarm calls.
It was a cold, increasingly cloudy afternoon, and
no wild crossbills were heard. I put 775 back in
the cell until the next recording session.
Dec 17 Brought out 306, 425, and three new birds from their
cell: 775 (male, R), 776 (?) and 777 (male, L). 306
gave some toops, [not recorded] immediately, then was
quiet. At 12:10 PM a lone, wild Type 2 bird flew
over getting no vocal response from the decoys.