Some Common Birds Useful to the Farmer (1915 edition) — John Shaqi
Some Common Birds Useful to the Farmer (1915 edition)Beal, F. E. L. (Foster Ellenborough Lascelles)
Science
Some Common Birds Useful to the Farmer (1915 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
Birds -- United States
In fact none of our native birds so much concerns the average farmer of
the Eastern States as the common crow. Many of our present criticisms
of this bird, as its pulling sprouting corn, feeding on ripening ears,
damaging fruits of various kinds, destroying poultry and wild birds,
and disseminating diseases of live stock, were common complaints in the
days of the early colonists. Many of the virtues of the crow, now quite
generally recognized, also have been matters of record for many years.
In recent times, however, scientific study of these problems, including
the examination of the stomachs of hundreds of crows secured in every
month of the year and under a variety of conditions, has enabled us to
render a much fairer verdict than was formerly possible.
The crow is practically omnivorous. During spring and early summer any
form of insect life seems to make a desirable item in its diet, and in
winter when hard pressed nothing in the animal or vegetable kingdoms
which contains a morsel of nutriment is overlooked.
The insect food of the crow, which comprises about a fifth of
its yearly sustenance, does much to atone for its misdemeanors.
Grasshoppers, May beetles and their larvæ (white grubs), caterpillars,
weevils, and wireworms stand out prominently. In 1,103 stomachs
examined these highly injurious forms comprised over 80 per cent of the
insect food. Grasshoppers are naturally taken in greatest abundance
late in the season, September being the month of largest consumption,
when they form about a fifth of the total food. May beetles and
white grubs are eaten in every month except January, but occur most
prominently in May. In June caterpillars are a favorite food, and
weevils of various kinds are taken in varying quantities throughout
summer and fall. About half of the remaining 20 per cent of insect food
is composed of beneficial ground beetles, ladybirds, predacious bugs,
and parasitic wasps, and related forms, the rest consisting of neutral
or injurious forms. Numerous instances are on record where fields badly
infested with white grubs or grasshoppers have been favorite resorts
of crows, whose voracity has resulted in a material suppression of the
pest. When the amount of food required to sustain the individual crow
is considered, the work of these birds appears all the more important.
Single stomachs containing upward of 50 grasshoppers are not uncommon.
Thus in its choice of insect food the crow is rendering an important
service to the farmer.
[Illustration: Fig. 16.—Crow. Length, about 19 inches.]
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