Life histories of North American woodpeckersBent, Arthur Cleveland
Science
Life histories of North American woodpeckers
Bent, Arthur Cleveland
Birds -- North America; Woodpeckers -- North America
The measurements of 58 eggs average 26.22 by 19.99 millimeters; the
eggs showing the four extremes measure =30.48= by 21.34, 26.67 by
=24.38=, and =23.37= by =17.27= millimeters.
_Young._--Major Bendire (1895) says of the young:
Both sexes assist in incubation, and this lasts about two
weeks. The young leave the nest about three weeks after
they are hatched, and are readily tamed. I kept a couple
for several days, but they had such enormous appetites that
I was glad to give them their liberty, as they kept me
busy providing suitable food. They were especially fond of
grasshoppers, but also ate raw meat, and climbed everywhere
over the rough walls of my house. A considerable share of
the food of these birds is picked up off the ground, and
they appear to be much more at home there than woodpeckers
generally are. The young are fed on insects, and I believe
also on berries; I have seen one of these birds alight
in a wild strawberry patch, pick up something, evidently
a strawberry, fly to a tree close by in which the nest
was situated, and give it to one of the young which was
clinging to the side of the tree close to the nesting site.
_Plumages._--The young Lewis’s woodpecker is hatched naked and blind,
but the juvenal plumage is acquired before the young bird leaves
the nest. In fresh juvenal plumage the red “face” of the adult is
replaced by black or dusky, though a young bird taken on July 22
shows some red mixed with the black in this area; the bill is small
and weak; the crown and occiput are dull brownish black, without any
greenish luster; the silvery-gray nuchal collar of the adult is wholly
lacking; the under parts are mostly dull pale gray or dull grayish
white, more or less suffused on the central breast and abdomen with
dull red or orange-red; the whole plumage is softer and more blended
in texture. Dr. J. A. Allen (Scott, 1886) says of some young birds
that he examined: “The back and upper surface of the wings are bronzy
green nearly as in the adult, with, however, in addition, broad bars
of steel-blue on the scapulars and quills. These bars are especially
prominent on the secondaries and inner vanes of the primaries, and are
seen also in some specimens on the rectrices. The steel-blue edging the
outer vanes of the quill feathers in the adult is absent; and the inner
secondaries and longest primaries are tipped more or less prominently
with white.”
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