1893.
April 9
(no 5)
Concord, Mass.
  At about 10.30 A.M. I saw the black Hawk
again. He was flying from Ball's to Davis's Hill
moving in a straight line, alternately flapping &
scaling. Something about his flight at once recalled 
to my mind the Swainson's Hawks which I used
to see daily at Colorado Springs and I am now
convinced that this bird is a Swainson's. He looked
nearly a black as a Crow to-day and not much
if at all larger. I think he is a male.
[margin]Swainson's 
Hawk[/margin]
  Wood Frogs were croaking in half a dozen places
this forenoon. We heard them in two small pools
which contained a good deal of ice.
[margin]Wood
Frogs[/margin]
  George Holden who called at the cabin in
the afternoon told me that he had just seen a
Pied-billed Greebe in the flooded meadow above
Bensen's landing.
[margin]Carolina 
Greebe[/margin]
  Sometime after sunset - indeed it was nearly dark at
this time - we saw several Robins cross the river from
the Bedford shore and pass around the E. end of Ball's
Hill flying very low and swiftly. Following them
we found a number assembled in a cluster of young
bushy white pines where they were evidently settling
themselves for the night calling to one another and
fluttering just as they do in autumn. Just how many
there were it was impossible to ascertain but we
saw and heard at least six or eight. They had
all become silent before we left the place.
[margin]Spring
Robin roost[/margin]