Кости крыла воробьинообразных. Источники - <a href="//commons.wikimedia.org/wiki/File:SwiftWingBones.png" title="File:SwiftWingBones.png">File:SwiftWingBones.png</a> общий вид, <i>Handbook of Bird Biology</i> pp. 178-179 детализация косточек.
<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>