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
They begin to arrive on the rice fields in the latter part of August, and
during the next month make havoc in the ripening crop. It is unfortunate
that the rice districts lie exactly in the track of their fall migration,
since the abundant supply of food thus offered has undoubtedly served to
attract them more and more, until most of the bobolinks bred in the North
are concentrated with disastrous effect on the south east coast when the
rice ripens in the fall, there was evidently a time when no such supply of
food awaited the birds on their journey southward, and it seems probable
that the introduction of rice culture in the South, combined with the
clearing of the forests in the North, thus affording a larger available
breeding area, has favored an increase in the numbers of this species. The
food habits of the bobolink are not necessarily easily inimical to the
interests of agriculture. It simply happens that the rice affords a supply
of food more easily obtainable than did the wild plants which formerly
occupied the same region. Were the rice fields at a distance from the
line of migration, or north of the bobolinks' breeding ground, they would
probably never be molested; but lying, as they do, directly in the path
of migration, they form a recruiting ground, where the birds can rest and
accumulate flesh and strength for the long sea flight which awaits them in
their course to South America.
[Illustration: Fig. 9.--Bobolink.]
The annual loss to rice growers on account of bobolinks has been estimated
at $2,000,000. In the face of such losses it is evident that no mere
poetical sentiment should stand in the way of applying any remedy which
can be devised. It would be unsafe to assume that the insects which the
birds consume during their residence in the North can compensate for such
destruction. If these figures are any approximation to the truth, the
ordinary farmer will not believe that the bobolink benefits, the Northern
half of the country nearly as much as it damages the Southern half, and
the thoughtful ornithologist will be inclined to agree with him. But even
if the bird really does more harm than good, what is the remedy! For years
the rice planters have been employing men and boys to shoot the birds
and drive them away from the fields, but in spite of the millions slain
every year their numbers do not decrease. In fact, a large part of the
loss sustained is not in the grain which the birds actually eat, but in
the outlay necessary to prevent them from taking it all. At present there
seems to be no effective remedy short of complete extermination of the
species, and this is evidently impracticable even were it desirable.
THE REDWINGED BLACKBIRD.
(_Agelaius phœniceus._)
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