1903.
April 8
  Cloudy and calm with light but steady rain. Warmer.
  Spent the forenoon at the farm transplanting trees.
It was a great singing morning. Indeed the birds
kept it up until nearly noon. Besides Robins, Bluebirds
Song Sparrows, Chickadees, Flickers & Phoebes I heard
no less than three Grass Finches and four Field
Sparrows besides a Pine and a Yellow Palm Warbler.
The Cooper's Hawk cackled almost incessantly
during the two hours or more that we spent in 
the Birch Field. He seems to have a favorite perch
in some tree just inside the eastern border of the 
neighboring pine woods for the sound usually comes
from the same spot although once the birds crossed 
to the other side of Birch Field & called three or 
four times. Gilbert, Hanson & Pat all took his
cackle to be the shout of a Flicker. There
is certainly some resemblance between the two
sounds although the fact has never occurred to me
before. The Hawk's cry, however, is harder & much
less musical than that of Colaptes. Its opening notes
moreover are given slowly & often disconnectedly.
  Went to Cambridge in P.M. As we were crossing the
river three Tree Sparrows flew past.