Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
humanistic point of view, and I am not yet willing to admit that
this pair of thrashers fits into a pattern except in the sense that
the lives of human beings may be said to fit into patterns. In
other words, I do not believe that every act of theirs, either as a
pair or as individuals, is a part of a framework over which they
have no control, or that they are mere marionettes responding to the
pull of strings actuated by unseen hands. I think they have undoubted
ed intelligence and perform many acts based on their recognition
of relationships between acts or things and are capable of drawing
inferences to a certain extent and regulate their behavior in accord-
ance with circumstances and conditions as they exist and are understood
in their environment; even to the extent of acting on occasion in
a manner contrary to instinct or inherited tendencies or previous
experience.
Feb. 20th.
Chase continues. At 8:30 A.M. the chase was continuing in the vicinity of the
glade. Both birds came to me at the same time for worms and there
was a lot of conversation during the lull in "hostilities". I went
up to the nest, followed by Brownie, but he immediately fled as
Greenie followed up the tree. Except in my immediate vicinity, B
does not get a chance to dig, preen or eat, drink or bathe; and now
he is not even permitted to guard the nest, much less sit in it!
If I were to hazard a guess as to what all of this means, it would
be that the female's reproductive instincts have been aroused earlier
in the season than the male's, and the action witnessed represents
her solicitation of him and his failure to respond.
Still chasing. At 9:30 Greenie was still following Brownie in and out of the bushes, Brownie avoiding too close approach. Both of them came to
me quickly when I offered food; eating at the same time, close together,
but B shy of his mate. Their talk to each other was almost con-
tinuous, varied and sweet. G made the "bell-call" almost in my ear: