1903.
May 9
  Clear & warm with fresh but only pleasantly cool E. wind.
  I cannot understand why this continued warm, fine
weather brings so few migrants. The only bird new to my list
to-day was the Usnea Warbler of which I heard one singing
but there was also a considerable flight of Bobolinks of which
I had noted only an individual before.
  Gilbert and I visited the Cooper's Hawk's nest this morning
and took the set of five eggs substituting for them an equal
number of Hen's eggs. While he was at the nest I heard
one of the Hawks cackling (no bird was on the nest when we
reached it although the eggs were warm) an the next moment
the male came glancing through the woods with great swiftness
on set wings heading straight for the nest. Just before
reaching it he lowered his flight and passed a yard or two
below Gilbert's feet brushing the trunk of the pine with
the tip of one of his wings. We did not see him again nor
did the female appear at all. Gilbert says that the nest
is neatly lined with scales of pine bark each places with
the inner surface exposed. Visiting Hemlock Knoll this
afternoon I found the ground under a large white pine
near the wood shed strewn with the feathers of a 
Carolina Dove and among them the broken, empty
shells of two of her eggs. The Doves have been seen there
on several occasions lately the last being May 3rd. I
attribute the slaughter of this poor bird to one of the
Cooper's Hawks but there is, of course, no proof of this.
I looked long & carefully for the Dove's nest but could not 
find it. I should have noted that on May 7th when Gilbert
was in the tree examining the Hawk's nest & the pair of birds were
circling high in the air one of them made a continued murmuring
sound very like that of a Musk Rat.