Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
began a variety of soft cakls, some of which can be roughly approx-
imated by:
European;
Wheet-reety, korra, korra, korra. The korra deep and throat
B then came down to me for worms, repeating the phrases noted, very
alert and watchful, though not with fear. His attitude was that of one
desiring to keep in touch with outside affairs while otherwise engaged
He then returned to his post in the old oak and again sang loudly,
being answered by Nova(?) with her mocking-bird song mixed with
standard thrasher phrases. Soon all song ceased and was replaced by
talk between B and the hidden bird. 50 minutes from the beginning
of the observation period, I looked at my watch, and when I looked up
again, B was gone. All was quiet, no birds in sight.
Going to the oval law, B was discovered eating pudding. Soon
Nova came from the direction of the glade. A third one appeared from
the bushes, and, shortly there were four of them all looking at me
at once. A tossed worm brought B and Bb. So much was certain. One
of the others was Nova with missing feathers on her neck and rough
back, and the third was probably Nb, looking big and strong. The
utmost harmony prevailed and they all went about their digging and
suet eating without friction of any kind. Finally they all retired
and talk was heard from the adjoining shrubbery and an occasional
bird reappeared, one being seen to eat pyracantha berries--still not
a common sight.
The evidence, though inconclusive, supports the view that at least
one of the young birds was singing full song without any observed
transition from immature"recording," though this can not be proved.
If it was, then it was at the age of about 11 weeks or about 2 months
after leaving the nest.
The object of the preceding observations was to determine if
Nova or the young birds sang full song; but conclusions are only ten-