Concord, Mass.
(Ball's Hill)
1900                                                                                                       
April 24 
(No.2)
(Blue Jay) the ground beneath my feet. The Jays
have been mimicking the Red Shouldered Hawks freely of late
and I have frequently heard both them and the Hawks
at the same time. The imitation is very perfect but 
the Jay seldom gives more than four or five & usually
but three or four whistles in succession while it never,
I think, attempts to reproduce the broken, cackling
notes which the Hawks interpolate among the kee-e-o
cries when they are screaming loudly & continuously.
Bearing these facts in mind it is not difficult to
distinguish between the voices of the two birds.
  One of the Yellow Red-poll Warblers sang so very
like a Chippy that I mistook it for that species at
first. Listening more intently & critically I found
that its song was really more hurried & broken than
that of the chippy.
Song of
Yellow-rumped
Warbler
  The Fish Hawk lingered about Ball's Hill
all day. A Crow followed it for some distance
rising above & plunging down at it but not
appearing to disconcert it in the last.
Osprey & Crow
(Enter this note under
Corvus americana
  I spent the day planting trees in the sandy
field by the wood shed. While thus engaged I
neither saw nor heard any birds of especial
interest.
42