Concord, Mass.
1902.
Oct. 4
  Clear with light N. to N.E. wind. Cooler.
  At sunrise this morning a Phoebee was in loud, full
song near the cabin for half-a-minute or more.
Phoebee in full song.
  About the same time a Pine Warbler on Ball's Hill
sang twice giving the spring song but with fewer notes than
usual. The loud, full quality of this bird's voice inclines me 
to think that it was an adult.
Pine Warbler sings.
  About 8 A.M. a Greater Yellow-leg passed this Hill flying
south-west at a considerable elevation. All this I gathered
from the sound of its voice for I did not see the bird at all.
Greater Yellow-legs.
  At the Farm, where I spent the earlier portion of
the afternoon, there were the greatest quantities of Bluebirds.
I counted 17 in one flock and must have seen upwards
of 40 in all, counting those noted at Ball's Hill & during 
the walk between the Hill and the Farm. At one time 
a dozen or more assembled in one of the big
elms where they clustered about a dead, upright prong
clinging to the bark & quivering their wings, occasionally
warbling in subdued tones. Every now & then they would 
suddenly scatter as if panic stricken but a few moments 
later would begin returning to the dead branch often remaining
there nearly motionless for minutes at a time. I have
frequently seen them behave in a similar manner before
at this season but why they do it I am at a loss
to conjecture. There were several Yellow-rumps with this
flock, and they were continually chasing, or being chased by,
the Bluebirds.
Abundance of Bluebirds.
Their peculiar behavior in autumn.
  I am very nearly - but not quite - sure that I heard
a Hudsonian Chickadee in Prescott's pines this morning. It gave
what sounded like the chip-chee-der-du-du twice but at some distance
from me. I hurried to the spot but found only some common
Chickadees.
Hudsonian (?) Chickadees.
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