Concord, Mass.
1901.
June 2
(No. 4)
  The song of the Blackburnian Warbler is highly variable.
That of the bird heard near Pulpit Rock this morning was
normal in form but it wholly lacked the usual wiry
quality being, indeed, rich and guttural in tone like
the song of the Usnea Warbler. The bird, a brilliantly
colored one, was feeding in the upper branches of a 
large white oak.
  In the woods, between Pulpit Rock and the road to
Bensen's we started an Oven-bird from her nest under
some pines on the top of a knoll. There were five eggs
which looked as if they had been incubated several days.
  As we approached the farm house we heard Red-shouldered
Hawks screaming loudly and presently saw four of them
soaring majestically in circles at a great height about
the earth nearly over Lawrence's house. For nearly
a minute all four were together; then they separated
two drifting off to the east ward, the other two towards
the west. As nearly as I could make out there
were two of each sex.
  Bluebirds have their first broods on wing and the
males are singing again but neither so freely nor so
frequently as they sing earlier in the spring. They are
as numerous this year as I have ever known them to be.
  The Phoebe at the farm was singing rather freely 
this morning. I think the female must have built a second
nest (her first was apparently deserted soon after it was finished)
in the barn cellar but as this cellar is half full of water, I
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