After Audubon's health began to fail, his family completed the project, producing the color plates in installments for about 300 subscribers.

The Fantastic Beasts of John James Audubon's Little-Known Book on Mammals

The American naturalist spent the last years of his life cataloguing America's four-legged creatures

From the Smithsonian National Museum of Natural History

100 Years After Her Death, Martha, the Last Passenger Pigeon, Still Resonates

The famed bird now finds itself at the center of a flap over de-extinction

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