1891
May 23
(No 4)
Canoe trip on Concord River.
Mass.
Concord to Wayland. - especially Black-poll Warblers.
A Water Thrush was singing at intervals and several
Yellow Warblers darting about among the bushes by
the water's edge. Of the latter species three individuals 
were continually passing and repassing the
spot where we were sitting, always keeping together
and flying from an apple tree to some low willows.
I was puzzled to account for the regularity of
their movements until I followed them and
found that one of them, a female, was getting
silk from a tent caterpillar's nest in the apple
tree and carrying it to her own nest among
the willows. Even then the mystery was not
wholly solved for the other two birds were apparently
males who seemed on the best of terms but each
of whom kept close to the female bird at all
times. Is it possible what she had tow husbands?
[margin]Yellow Warblers[/margin]
  The song of a Pine Warbler on the hill above
us tempted me to look for the nest. I came
on the female very soon and followed her for
several minutes but finally lost sight of her.
After looking for the nest in all the most
promising trees I found it, at length, in a 
small, isolated, pitch pine which stood near
the river bank directly in front of a summer
camp house or shanty. It was built on a long
horizontal branch near the end and directly
above a cluster of three cones which served
admirably to conceal it from beneath which 
the pine needles nearly covered it above. It was
barely 12 feet from the ground and we had
[margin]Pine Warbler's nest[/margin]