AcroA member of the genus Acrocephalus, part of the family Sylviidae. This abbreviation for the scientific name of the genus is used mainly in ringing and twitching. Among the species concerned are the Sedge Warbler A. schoenobaenus and the Reed Warbler A. scirpaceus.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver