Dodo

With no natural predators on the island of Mauritius, the Dodo's ancestors lost their ability to fly.
Dodo Illustration, BHL

Slideshow Image Credits
Frederick William Frohawk's restoration of Raphus cucullatus from Extinct birds London: Hutchinson,1907. Biodiversity Heritage Library; Dodo Restoration. The human side of birds. New York, Frederick A. Stokes company[c1917]. Rowland Ward model of a Dodo. Museum of Comparative Zoology, Harvard University © President and Fellows of Harvard College