1906
April 17
  Clear and warm with light, variable winds, chiefly from 
the N. and N.E.
  Although last night was especially favorable for migration
no new birds were noted to-day.
  A Partridge drummed several times in the run below
the house about 9 A.M. It is the first time I have
heard one this year.
  Robins continue scarce. I see only one or two on the
farm and there was no singing to-day, not even at
sunset.
  About ten o'clock this forenoon I heard our Phoebe
calling loudly and excitedly near the house. Looking up I saw a
male Cooper's Hawk circling just above the top of one of the
large elms. I had a good view of him through my glass at a
distance of about 60 yards & made sure of his identity.
He soon began rising and continued to ascend, soaring all
the while with scarce a single wing beat, until he was almost
lost to the naked eye although still clearly overhead. At
length he ceased circling and started off towards the N.E. in
a perfectly straight course, flapping his wings incessantly and
moving very swiftly. I watched him through my glass
until he faded out of sight in the distance but he did not
once falter or change his course. I think he must have started
on migration after trying to get something for breakfast.
While soaring and rising he moved as smoothly & gracefully
as a Buteo but in rather small circles, turning always from
left to right.