Concord, Mass.
Ball's Hill 
1900
May 18
  Cloudy, foggy, calm or with an occasional breath of E wind.
  Ransacked the Ball's Hill woods & thickets directly after
breakfast. Saw or heard a few Black-polls & Yellow rumps,
a good many Wilson's Black-caps, very many Canadian Warblers,
a Black-throated Blue and a Black & Yellow, a Blackburnian, 
an unprecedented number of Water Thrushes (at least 20) 
a Lincoln's Finch and a great number of common resident
birds such as Cat birds, Red eyed Vireos, Chestnut-sided Warblers
etc.
North bound
migrants
abundant.
Water Thrushes
Lincoln's F.
  The Water Thrushes not only fairly swarmed along the
river banks but were scattered about everywhere among
the oaks on the sides & top of this Hill. I have
never known them to be so numerous here before.
Water Thrushes
  A Snipe drummed for nearly an hour over the marshes
opposite the cabin. This was between 7 & 8 A.M. the
weather foggy at the time.
Snipe drums
  A Least Flycatcher perched in the top of a leafless oak
suddenly launched out & caught a Butterfly.
He struggled with it for several minutes repeatedly beating
it against the branches, frequently dropping it & recovering it
finally reducing it to pulp & swallowing it.
Least
Flycatcher
catches &
eats a butterfly
  Most of the Maryland Yellow-throats which have been
so numerous here during the past week have evidently
been migrants. They have been found everywhere, quite
as frequently on dry Willows & hill tops or in dense, dry
oak woods as in swampy plains. I saw a female this
morning feeding in the upper branches of a rather tall
white pine. The woods have been silent as a rule.
Migrating
Maryland
Yellow-throats
on dry,
wooded,
hillsides