Concord, Mass.
1911.
Oct. 31
[October 31, 1911]

  A mild, humid day, for the most part cloudy with fresh
S.W. [Southwest] wind and a few light showers.

Remarkable diurnal migration of Robins & Crow Blackbirds

  In the early morning when the sun was striving to shine
dimly through thin clouds and there was not a breath of wind
I witnessed a rather remarkable and very unmistakeable
migration of Crow Blackbirds and Robins. Shortly before 8
o'clock as I was standing near our barn I heard a confused
medley of Blackbird voices in the distance towards the north-east,
& presently saw the birds afar off and very high in air (certainly
not less than 1000 feet) coming directly towards me and flying
- as is their wont when on migration - with exceeding swiftness
and directness and without trace of the undulating curves
which are so characteristic of their ordinary flight. The flock
was by far the largest that I have ever beheld. There must
have been fully 1000 birds & they literally crowded at
least an acre of sky affording a truly inspiring sight as