Some Common Birds Useful to the Farmer (1926 edition)Beal, F. E. L. (Foster Ellenborough Lascelles)
Science
Some Common Birds Useful to the Farmer (1926 edition)
Beal, F. E. L. (Foster Ellenborough Lascelles)
Birds -- United States
The robin[5] (fig. 2), in many parts of the country one of the most
cherished of our birds, is found throughout the States east of the Great
Plains, and is represented farther west and south by slightly different
subspecies.[6], [7] It breeds far north through Canada, and is found even
in Alaska. Although the great bulk of the species leaves the Northern
States in winter, a few individuals remain in sheltered swamps, where
wild berries furnish abundant food. The robin is an omnivorous feeder
and its food habits have sometimes caused apprehension to the fruit
grower, for it is fond of cherries and other small fruits, particularly
the earlier varieties. For this reason many complaints have been lodged
against robins, and it has been necessary to permit the killing of the
birds in some fruit-growing regions.
[5] _Planesticus migratorius_.
[6] _Planesticus migratorius propinquus_.
[7] _Planesticus migratorius achrusterus_.
Examinations of 1,236 stomachs show that 42 per cent of its food is
animal matter, principally insects, while the remainder is made up
largely of small fruits or berries. Over 16 per cent consists of beetles,
about one-third of which are useful ground beetles, taken mostly in
spring and fall when other insects are scarce. Grasshoppers make up about
5 per cent of the whole food, but in August they comprise 17 per cent.
Caterpillars form about 9 per cent, while the rest of the animal food,
about 11 per cent, is made up of various insects, with a few spiders,
snails, and angleworms. All the grasshoppers, caterpillars, and bugs,
with a large portion of the beetles, are injurious, and it is safe to say
that noxious insects comprise more than one-third of the robin's food.
Vegetable food forms 58 per cent of the stomach contents, over 42 per
cent being wild fruits and only a little more than 8 per cent being
possibly cultivated varieties. Cultivated fruit amounting to about 25 per
cent was found in the stomachs in June and July, but only a trifle in
August. Wild fruit, on the contrary, is eaten every month and constitutes
a staple food during half the year. No less than 65 species of fruit were
identified in the stomachs; of these, the most important were 4 species
of dogwood, 3 of wild cherries, 3 of wild grapes, 4 of greenbrier, 2
of holly, 2 of elder; and cranberries, huckleberries, blueberries,
barberries, service berries, hackberries, and persimmons; together with 4
species of sumac and various other seeds not strictly fruit.
Public-domain text, read in full here on John Shaqi.
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