1901.
July 21
Concord, Mass.
  Most of forenoon cloudy; afternoon clear with light S.W. wind.
An oppressively warm day.
  Down to the farm at 9 A.M. walking back through
the woods an hour later. The air was oppressive among
the trees and deer flies were numerous and most
annoying but the mosquito season is nearly over.
  Only a few birds were singing and of them few only
the Tanagers were in really full, vigorous song.They
seem to love hot weather and to sing later into the
summer than most other wood-haunting species. I 
heard at last three different males this forenoon.
  An adult male Redstart accompanied or rather followed by
a young bird appeared in front of the cabin just after
dinner. The young bird was very noisy calling almost
incessantly for food & following his father so closely that
the latter had difficulty in keeping his foothold at times.
The young Redstart had all the pretty, fussy ways of
jilting his tail and half opening & shutting his wings
that are so characteristic of this species.
  As I was crossing Birch Field I was surprised to see
a Black Duck flying just above the tops of the trees,Two
other Ducks of this species passed Ball's Hill together
later in the day.
  At about 6 P.M. I heard a loud, prolonged, sobbing
whistle given three times at regular intervals, evidently by
some bird flying S.W. over Ball's Hill. It sounded familiar
but I could not place it at first. Finally I remembered what
it was - the flight call of a Hudsonian Curlew.
  Three or four large flocks of young Red-wings in all fully
200 birds passed up river at sunset.