Passenger Pigeon. Zeichnung von John James Audubon, welcher 1851 starb - deshalb gemeinfrei.
<bdi><a href="https://en.wikipedia.org/wiki/en:John_James_Audubon" class="extiw" title="w:en:John James Audubon"><span title="American ornithologist, naturalist, and painter (1785–1851)">John James Audubon</span></a>
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Unknown date<div style="display: none;">Unknown date</div>
<a rel="nofollow" class="external free" href="http://www.ulala.org/P_Pigeon/imgs/Pigeon_8.JPG">http://www.ulala.org/P_Pigeon/imgs/Pigeon_8.JPG</a>