Birds of Northern South America Set Format:Paperback Second Essay by Jon Fjeldså:

Second Essay by Jon Fjeldså: The Discovery of New Bird Species

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Birds of Northern South America Set Format:Paperback Second Essay by Jon Fjeldså:The 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,