<a href="//commons.wikimedia.org/wiki/Mallard" class="mw-redirect" title="Mallard">Mallard</a> female, <a href="https://en.wikipedia.org/wiki/University_of_York" class="extiw" title="en:University of York">University of York</a>
<a href="//commons.wikimedia.org/wiki/User:Gurch" class="mw-redirect" title="User:Gurch">Gurch</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>