Hobbs Brook Reservoir, Waltham.
1909.
Nov 12 [November 12, 1909]
(No 2)
lower part of the reservoir before alighting again
near where they were first noticed. At no time were
we much nearer them than half-a-mile but we saw
them in a good light, with powerful glasses. I was
satisfied that they were Scaups but very doubtful as
to whether they belonged to the larger or to the smaller 
species (Maynard had previously referred them to the former).
  On our return over the road that skirts the
western side of the reservoir we saw three Black
Ducks on a pebbly beach and a pair of Mergansers
swimming about 200 yards from shore. At the latter
birds we had a fine view & through our glasses it was 
easy to make out every detail of color & marking
in the clear sunlight. They were unmistakably
Red-breasted Mergansers, a young [male] already showing
some traces of the mature plumage, and a female,
Black Ducks.
Red-breasted Mergansers