Manual of Natural History

Cover Manual of Natural History
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" For the rest, there is always a very good means of ascertaining if certain birds are useful or injurious to agriculturists, and this is to kill one or two occasionally at different seasons of the year, and to notice what food they have in their stomach ; if corn, the bird is mischievous, but if it is remains of insects or grubs, the bird is useful. This is the best method of judging of the merits of such birds as rooks, which are alternatively regarded as useful or mischievous. But it will no...t suffice to limit ourselves to examining what the bird eats once in the course of the year ; it will be necessary to begin again at different seasons, because a bird which eats corn at harvest-time or seed-time for instance, destroys insects all the rest of the year ; and the farmer must then calculate whether the injury done by the bird in eating his corn, is counterbalanced or not by the advantage of seeing them destroy his true enemies i. E. , insects. In a general way we may say that all birds live on insects in spring, corn in summer, and berries in winter.

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