Passenger Pigeons from the Denver Museum of Nature & Science (IMAGE)
Caption
The historical population of passenger pigeons in North America was estimated to be 3 to 5 billion. Their huge flocks darkened the sky. Yet by the early 1900s they had disappeared from the wild, and the last captive bird died in 1914.
Credit
Rene O'Connell
Usage Restrictions
For use only with news coverage of this research
License
Licensed content