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Two groups, the tropic birds and frigate birds, are essentially confined to the
tropics; the boobies, pelicans, and anhingas are widespread in the tropics but
also penetrate far into the temperate zones; and cormorants breed from the
Equator to ...
In the pelecaniforms, as in most birds, replacement of the feathers (molt) occurs
mainly in the intervals between breeding. In a few species molt progresses
concurrently with breeding activities, but normally, a complete molt commences
In the Aythyini and the Oxyurini such nest-parasitism is so common that it
influences the breeding biology of a population. Only one species, the black-
headed duck (Heteronetta atricapilla) of South America, is an obligate nest-
parasite, always ...
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review