Birds of Northern South America An Identification Guide, Volume 1: Species Accounts Mammalogy The illustrations include adult males

The illustrations include adult males and females where different as well as intermediate plumages

and elsewhere

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Birds of Northern South America An Identification Guide, Volume 1: Species Accounts Mammalogy The illustrations include adult malesThe two companion volumes of this extensive and detailed guide make a groundbreaking contribution to bird guide literature: they not only provide detailed accounts of every known bird species in the vast region from Ecuador to French Guiana but also, for the first time, illustrate virtually every plumage variation in full color. The illustrations include adult males and females where different as well as intermediate plumages, juveniles, subspecies,