1902.
May 6
(No. 2)
low over the thickets at the east end of Ball's Hill
a little later and the Red-shouldered Hawks which
soar and scream every morning over the Ball's Hill woods
never appear to alarm them.
  I was somewhat surprised to hear a Wilson's thrush
sing three or four times at about ten o'clock this
morning on Pine Ridge for I noted the first bird of
this species yesterday and it is unusual for them
to begin singing for several days after their arrival
while they are sometimes silent for a week or more.
  At 4.30 P.M. a flock of four Black Ducks 
passed over Pine Park in the direction of Great 
Meadow where I think they alighted for they
lowered their flight abruptly just as they passed
beyond my sight (I was on Pine Ridge at the time)
over the belt of trees that line the river bank.
These must have been some of our summer resident
birds. I am by no means sure that they breed
in this neighborhood but incline to think that 
they come from the Cambridge Region. Walter Dean
tells me that a Black Duck's nest with 13 eggs 
was found at Rock Meadow, Belmont about two
weeks ago. It has been visited by many people
interested in birds and among them by George Dean.
64