Song periodThe part of the year during which the song of a particular species can be heard. Some birds, such a the Wren Troglodytes troglodytes, sing virtually all year round, but most have their song periods confined to part of the year. The Blackbird Turdus merula, for example, sings mainly between the end of February and early July.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver