Question

Most of the year, the hermit thrush, a north american songbird, eats a diet consisting mainly of insects, but in autumn, as the thrushes migrate to their central and south american wintering grounds, they feed almost exclusively on wild berries. Wild berries, however, are not as rich in calories as insects, yet thrushes need to consume plenty of calories in order to complete their migration. One possible explanation is that berries contain other nutrients that

Answer 1

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