Life histories of North American woodpeckersBent, Arthur Cleveland
Science
Life histories of North American woodpeckers
Bent, Arthur Cleveland
Birds -- North America; Woodpeckers -- North America
Charles W. Michael (1926), in the Yosemite Valley, made the interesting
discovery that the California woodpecker has been known to learn by
experience and to show some intelligence in its acorn storing. For a
number of years when acorns were abundant no extensive storing was
done, yet the woodpeckers lived in the valley all winter. Then came a
lean year, with no acorn crop, when no storing _could_ be done; and
that winter the woodpeckers were forced to leave the valley for lack
of food. The following year there was a bountiful crop of acorns, and
the woodpeckers, having learned by experience, were busy filling up
their storehouses. “From the above observations,” he says, “one might
conclude that an abundance of acorns is not directly responsible for
prodigious storing. In a land of plenty the necessity of laying aside
stores for future consumption is obviated. It is the barren years that
teach the value of thrift. Intelligence plus experience may well have
been the cause of the excessive storing of this year. A few of the more
intelligent woodpeckers that were forced last winter to abandon the
valley for lack of food are now preparing against the next lean year.”
Claude Gignoux (1921) reports finding almonds stored in the bark of an
oak tree on a ranch near Marysville, Calif., as well as in the side of
a barn.
Dawson (1923) says: “A regrettable taste for fruit is occasionally
cultivated, but this has not reached economic proportions, save in the
case of almonds. Almond orchards thrive best at a very considerable
distance from oak groves.”
Although acorns, almonds, walnuts, and pecans constitute nearly 53
percent of its food, and much more than that in fall and winter, the
California woodpecker eats quite a variety of other food at different
seasons. Prof. F. E. L. Beal (1910) examined the contents of 75
stomachs, which contained “22.43 percent of animal matter to 77.57
percent of vegetable.” Bendire (1895) says: “During the spring and
summer its food consists, to a great extent, of insects, including
grasshoppers, ants, beetles, and different species of flies, varied
occasionally with fruit, such as cherries, which are carried off whole,
apples, figs, and also berries and green corn.”
Public-domain text, read in full here on John Shaqi.
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