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Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
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Transcription
lending variety and spice.
Full Song.
The fourth type is the full song, brilliant and powerful,
rich and varied when heard nearby. At a distance most of its
charm is lost. It is primarily an amplification in volume of the
preceding, but as yet, I have heard little mimicry in it. Like
the preceding its range in pitch is great. Anyone hearing it nearby
for the first time invariably exclaims "What's that?" This is usual-
ly followed by the statement that he never knew that there was such
a bird. It can undoubtedly be heard for a quarter of a mile, possibly
even farther under favorable conditions. I have heard it plainly
mostly
300 yards away, but its beauty is gone under such conditions. It
is like looking down upon a landscape covered by fog with only
a hill-top showing through here and there. That is a beautiful
enduring
sight, it is true, but the kind of beauty is concealed.
It might be said that these thrashers have a full song and
three sub- or undersongs of the same general characteristics,
merging into each more or less and differing from each other princi-
pally in volume, brilliancy and variety of expression. They
might with propriety be classified as full, three-quarter, half
to
and quarter song without doing too much violence quantitative
exactitude.
Singing points.
(Locations)
Full song usually is heard from a perch at least ten feet
above the ground at this place, and from there up to about 50 or
60 feet, although the latter heights are unusual. The bird is usual-
ly in plain view, or at least not concealed. From my observations
so far it is never sung on the ground. It is heard usually during
the early morning hours here, but, as recently recorded, sometimes
at any time during the day. I have heard it in the rain, but never
at night. It is seldom heard during the nesting season, but
frequently before and after, even during the moult. I can not
say that one bird sings while the other is on the nest, or when