Birds of Northern South America Set Format:Paperback Audubon was not the father

Audubon was not the father of American Ornithology

and its light weight allows carrying many poles into the field with little effort

- Tree Hammock Hugger

you require two (2) sets

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

Birds of Northern South America Set Format:Paperback Audubon was not the fatherThe 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,