1892
July 16
(No 2)
Concord, Massachusetts.
Mass.
Concord.- It is doubtless the rule that birds
which sing regularly and freely [delete]during[/delete] now rear two
broods in a season. Such are the Robin, Bluebirds,
Song Sparrow, Swamp Sparrow, Chippy, Field Sparrow,
Grass Finch, Towhee, Pine Warbler, and Carolina Dove.
All these certainly rear two broods. I am doubtful
about the Cat bird and Veery, both of which are still
singing well. Obvious exceptions to the rule are the
Yellow-throated and Warbling Vireos which certainly
do not breed twice but which sing late into the
summer. A male of the latter species which brought
off its young successfully late in June and then left
them to the care of the mother has thus far
sung continuously, since his arrival in early May, in
the trees about the house. I heard him least often
at the time when he was assisting the female in
the care of the young, just from the nest, but [delete]then[/delete] he
has not been wholly silent for a day this season
and he is now singing as freely as he was in early
June.
[margin]Cessation of
bird singing[/margin]
[margin]Warbling Vireo[/margin]
  The Red-eyed Vireo breeds very irregularly and I
have often found nests with fresh eggs in July
but this is probably due to the fact that the
first nests are nearly certain to be plundered
by Jays or Squirrels. On the whole I do not
think that this bird habitually if ever has
two broods in a season in this state.
Nevertheless it regularly sings later into the summer
than does almost any other bird.
[margin]Red-eyed
Vireo[/margin]