1907
April 30
  Clear and very warm with strong S.W. wind.
  Arrivals. Black-throated Green Warbler, 1 male (seen by Nelson)
in Prescott's Pines; Oven-bird, male heard singing by
Gilbert in the woods at the Farm; Solitary Vireo,
one heard singing by me on Ball's Hill, then
seen together in Prescott's Pines by Nelson.
Arrivals
 Most of the birds here yesterday must have passed
on northward last night for there were very few to-day
in the Ball's Hill woods. Mr. Nelson (of Mus. Comp.
Zoology) reported seeing a good sized flock of Yellow-
Rumped and Yellow Palm Warblers in Prescott's Pines,
however.
  As I was strolling behind Ball's Hill this
evening two Crows rose from the pines on its crests.
One mounting above the other to a height of about
thirty feet swooped down at it with half closed
wings uttering a hard, wooding coc-coc-coc-coc-
coc-coc not unlike the sound of a watch man's
rattle worked slowly. Just as the upper bird reached
the lower one the latter dodged and twisted, closely
pressured by the other. This was repeated several times
with always the watch man's rattle notes given during
the plummets like fall and after that the swift,
devious pursuit accompanied by many most graceful
evolutions. Finally the pair (for I judged them to be
a male & female) were joined by a third bird when
all three winged their way off over the meadows
together without further demonstratations or calling.
Crows