Life histories of North American woodpeckersBent, Arthur Cleveland
Science
Life histories of North American woodpeckers
Bent, Arthur Cleveland
Birds -- North America; Woodpeckers -- North America
_Food._--W. Leon Dawson (1923) writes: “Nearly half of the Cabanis
Woodpecker’s food consists of the larvae of wood-boring beetles
(the _Cerambycidae_ and _Buprestidae_); and of the remainder the
caterpillars of various injurious moths form a large per cent. Wild
raspberries and blackberries are eaten in summer, and certain hardy
fruits, such as cornel berries, acorns, and the pits of the islay, or
evergreen cherry (_Prunus ilicifolia_), eke out the winter sustenance.”
Referring to its manner of feeding, Milton P. Skinner says in his
notes: “On August 10, 1933, I saw a Cabanis working on both the trunk
and the limbs of a small Douglas fir. It worked all around a horizontal
limb and really seemed to be under the limb more than above. It also
worked on upright branches as well. I have also seen a Cabanis feeding
on the bark of a lodgepole pine. One day I found one on a dead black
oak, scaling off dead bark to get at the insects beneath. So far as I
can tell, these birds, in the Sequoia National Park, seem to prefer to
pick food from the surface and furrows in the bark, and do not bore
into the bark and wood as much as other woodpeckers. During my work
among the Big Trees, I noticed that these birds seem to avoid the
sequoia’s bark; but at one place I found a living tree with many holes
bored in the old wood of its charred base, where it was unprotected by
bark.”
_Behavior._--Mr. Skinner’s notes say that “this woodpecker has quite a
few mannerisms of its own. One, seen flying across a meadow, went first
to the limbs of Douglas firs, then to a small dead limb of a sequoia,
then to the limb of a fir, and then to the trunk of the same fir. It
perched lengthwise of limb and trunk each time. And this procedure was
followed again and again on different days. Usually the Cabanis perches
crosswise on a horizontal limb, especially when resting or preening,
but lengthwise on erect, or nearly erect, trunks and limbs when feeding.
“Although this woodpecker almost always flies to the exact spot it
selects, its flight through the forest is undulatory. The undulations
are due to the fact that it progresses by a series of wing beats. At
the end of each series, it seems to actually close its wings and shoot
forward with the impetus gained.”
DRYOBATES VILLOSUS MONTICOLA Anthony
ROCKY MOUNTAIN HAIRY WOODPECKER
HABITS
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