The passenger pigeon was an animal lifeform, an extinct species of bird that was once native to Earth's North American continent. It was estimated that there were once millions of these pigeons that travelled in huge flocks across the continent.

In 2266, Professor Robert Crater compared the M-113 creatures to the passenger pigeon, when millions of them roamed the surface of planet M-113. (TOS - Star Trek 1 novelization: The Unreal McCoy)

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