Bethel, Maine.
1907.
Jan'y 21
  A mixed flock that lingered long about a sunny
opening in dense, well-grown woods (the "Glen Woods") of
balsam, arbor vitae and white pines, contained four Hudsonian
Chickadees, five Common Chickadees, two Golden-crested
Kinglets, a male Canadia Nuthatch and a male Hairy Woodpecker.
A Log Cock called over not far away and Lesser Redpolls
flew over at frequent intervals. I had a good opportunity to
watch the Hudsonian Chickadees at close range in a clear
light and stayed with them for half-an-hour or more
making the following notes: For a time they kept high up
in the tops of some tall balsams working away the  cones
apparently extracting and eating the seeds. The Nuthatch was
with them here for several minutes but the Black-cap
Chickadees remained lower down. The Hudsonians differed
from the Black-caps as follows: - They were much less
noisy (after passing minutes at a time in absolute silence);
they seldom hung head downward: they hopped and flitted
among the branches more actively and ceaselessly, spending
less time in one place; their shorter tails were less in
evidence; they flirted their wings much more with a 
more nervous, tremulous motion very like that of Kinglets;
the black patch on the throat was less conspicuously shown;
they appeared shorter, "chunkier" and fluffier; the
chestnut brown on the flanks was very aparent. Altogether
they seemed to me less attractive and interesting than the
Black-caps. In their manner of flitting ceaselessly from
twig to twig, as well as by the tremulous motions of
their wings, they reminded me very foricbly of Kinglets.
I heard the explosive tch-day, day a few times and the
abrupt tch-tchip over. They did not once give the
low soft chips so constantly uttered by the Common Chickadee.
Parus hudsonicus