Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
1627
This was a day of about the same temperatures as yesterday.
September 2nd.
minor convention.
Thresher song was first heard at 5:25 A.M. By 9 A.M. the
beginning of a convention, apparently called by the lone singer at
home, was heard in the pine trees along the north fence. However,
only one singer and two silent birds could be located. The singer
was identified as Neo and at least one of the others was probably N2,
since she followed Neo up in to the pine, as is her custom.
About 10 o'clock, Neo sailed off to the northwest landing
about 200 yards away, down at Dr. Moore's, and renewed song. The
other two were seen to start in that direction as if following.
I now left, returning at 3:30 P.M. No thrashers were to be heard
or seen, and Julio reported that they had not gathered again, as far
as he knew.
Rhody to bed
at 5 P.M.
Rhody again slept in house No. 2. He was found already set-
tled there at 5 P.M.
September 3rd
No early song.
Convention assembles.
No early thresher song was heard. A dull, chilly morning:
54° at 8:45. That time marked the commencement of the first thrash-
er song of the day here. The singer was Neo, in the pine south of
the tool-house. Soon N2 (?) ran to his tree from the oval lawn and
climbed up. Occasionally she uttered a phrase or two.
More song was now heard north of the house. Three birds now.
Another struck up. At first I thought it was a black-headed gros-
beak song with variations--something I had never heard before. I
went and saw the bird: a thrasher. For the 15 or 20 minutes he sang
the grosbeak motif distinguished him clearly from all the other
singers--now three in number. The number, including non-singers--
now increased to 5 certainly, 6 less certainly.
At 9:15 all song ceased and no thrashers could be seen.
At 9:30 Neo (?) mounted a little three foot oak 50 feet from the nort
fence and began to call and sing, looking in all directions as if
hoping to see others coming. 5 minutes of this without response of
any kind and he quit. 10 minutes later he adopted the pine north
of the kitchen as a singing post. Here he had better luck and the
thrashers began to gather near him again, but in other trees. I now
had to leave.
Returning at 10:30, I found all quiet, except for two thrash-
ers (mates?) talking in the shrubbery about the oval lawn, in low
tones. One came out to get worms from me and, curiously often dug
in the ground by them before eating them. Shortly afterwards, after
he had returned to the shrubbery, the other came out into the drive-
way near where I sat and also accepted worms. (Neo and N2?).
Neo went to the sparrowhawk pine and started full song. (This
tree partly overhangs the Nichols' back lawn). The lawn was full
of robins, about 20, perhaps a third of them juveniles still with
their spotted plumage. Among the robins was one thrasher foraging.
The robins took angleworms, the thrasher some other kind of worm (cut
worms?). More thrashers came. Scenes of day before yesterday were
repeated; 6 birds concerned (almost certainly), 5 birds (with abso-
lute certainty). Not less than three good singers. Except for
the singers, the principal objective seemed to be food. When Neo join-
ed the bird on the lawn and in the surrounding shrubbery, stifflegg
ed posturing by him and another followed, but no conflict. For the
first time it appeared that Neo wished to lead this bird back over
the fence. He made what appeared to be a dozen efforts to induce