Passenger pigeons, like these stuffed examples at the Denver Museum of Natural History in Colorado, were once plentiful in North America. They went from the status of least concern to extinct within 100 years.

Photograph by Jack Fletcher
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endangered species
endangered species Encyclopedic Entry

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Biology, Geography

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An endangered species is a type of organism that is threatened by extinction. Species become endangered for two main reasons: loss of habitat and loss of genetic variation.