Some Common Birds in Their Relation to Agriculture — John Shaqi
Some Common Birds in Their Relation to AgricultureBeal, F. E. L. (Foster Ellenborough Lascelles)
Science
Some Common Birds in Their Relation to Agriculture
Beal, F. E. L. (Foster Ellenborough Lascelles)
Birds -- United States
It is evident that a bird so large and so abundant may exercise an
important influence upon the agricultural welfare of the country it
inhabits. The crow blackbird has been accused of many sins, such as
stealing grain and fruit and robbing the nests of other birds; but the
farmers do not undertake any war of extermination against it, and, for the
most part, allow it to nest about the premises undisturbed. An examination
of 2,258 stomachs showed that nearly one-third of its food consists of
insects, of which the greater part are injurious. The bird also eats a few
snails, crayfishes, salamanders, small fish, and occasionally a mouse. The
stomach contents do not indicate that it robs other birds' nests to any
great extent, as remains of birds and birds' eggs amount to less than one
half of 1 per cent.
It is, however, on account of its vegetable food that the grackle is most
likely to be accused of doing damage. Grain is eaten during the whole
year, and during only a short time in summer is other food attractive
enough to induce the bird to alter its diet. The grain taken in the
winter and spring months probably consists of waste kernels gathered from
the stubble. The stomachs do not indicate that the bird pulls sprouting
grain; but the wheat eaten in July and August, and the corn eaten in the
fall, are probably taken from fields of standing grain. The total grain
consumed during the year constitutes 45 per cent of the whole food, but
it is safe to say that at least half is waste grain, and consequently of
no value. Although the crow blackbird eats a few cherries and blueberries
in their season, and some wild fruit in the fall, it apparently does no
damage in this way.
Large flocks of crow blackbirds no doubt do considerable injury to grain
crops, and there seems to be no remedy except the destruction of the
birds, which is in itself expensive. During the breeding season, however,
the species does much good by eating insects and by feeding them to its
young, which are reared almost entirely upon this food. The bird does the
greatest amount of good in spring, when it follows the plow in search
of large grub worms, of which it is so fond that it sometimes literally
crams its stomach full of them. The farmer must decide for himself
whether or not these birds cause more damage than can be repaid by insect
destruction; but when they destroy an entire crop it is no consolation to
know that they have already eaten a multitude of insects which, if left
alone, would have accomplished the same result.
THE SPARROWS.[2]
[2] The sparrows here mentioned are all native species. For a full
account of the English sparrow, including its introduction, habits, and
depredations, see Bull. No. 1 of the Division of Ornithology, published in
1896.
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