SubfamilyA division of a family, standing between the family and the tribe or genus in taxonomy. The scientific name of a subfamily ends in '-inae'. The wildfowl family (Anatidae) is divided into three subfamilies, of which two have representatives in the British Isles, namely the Anserinae (swans and geese) and the Anatinae (ducks).
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver