Passenger pigeons, from John James Audubon’s Birds of America

Passenger pigeons, from John James Audubon’s <em>Birds of America</em>

Courtesy National Audubon Society, Inc., 700 Broadway, New York, NY 10003, USA.

In 1813, naturalist John James Audubon called passenger pigeons “wonderfully abundant.” A century later the species was extinct.

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