Endangered and Extinct Species

Last seen: 1914.

Where: U.S.

Reasons: Over-hunting; loss of habitat as forests were cleared and converted to farmland.

Other: The passenger pigeon was once the most numerous and successful species of bird to ever exist on earth, living in almost inconceivable numbers across all of forested North America. It is estimated that there were 3 billion to 5 billion passenger pigeons at the time Europeans arrived in North America and that they once constituted an amazing 25-40% of the total bird population of the U.S.
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  thanks to Spitting Image