HippoA member of the genus Hippolais, part of the family Sylviidae. This abbreviation for the scientific name of the genus is used mainly in ringing and twitching. There is no commonly found representative of the group in the British Isles, but the Icterine Warbler H. icterina is a scarce passage migrant.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver