Сравнение костей крыла стрижа (Apus apus) и воробья (Passer domesticus)
<a href="//commons.wikimedia.org/w/index.php?title=User:Retired_electrician&amp;action=edit&amp;redlink=1" class="new" title="User:Retired electrician (page does not exist)">Retired electrician</a>
<span class="int-own-work" lang="en">Own work</span> collage of <a href="//commons.wikimedia.org/wiki/File:Bird_wing_skeleton._Apodidae.svg" title="File:Bird wing skeleton. Apodidae.svg">File:Bird wing skeleton. Apodidae.svg</a> and <a href="//commons.wikimedia.org/wiki/File:Bird_wing_skeleton._Passeri.svg" title="File:Bird wing skeleton. Passeri.svg">File:Bird wing skeleton. Passeri.svg</a> along the lines of <a href="//commons.wikimedia.org/wiki/File:SwiftWingBones.png" title="File:SwiftWingBones.png">File:SwiftWingBones.png</a>