EctoparasiteA parasite living on the outside of its host's body, as opposed to an endoparasite. Birds are subject to a great deal of infestation by ectoparasites on their skin and in their plumage and nests. The feather louse is a good example, but in addition there are other lice, fleas, mites and ticks.
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From Peter Weaver's Birdwatcher's Dictionary
Copyright © 1981 by Peter Weaver