An American Black Duck (<a href="//commons.wikimedia.org/wiki/Anas_rubripes" title="Anas rubripes">Anas rubripes</a> top left) and a male Mallard (<a href="//commons.wikimedia.org/wiki/Anas_platyrhynchos" title="Anas platyrhynchos">Anas platyrhynchos</a> bottom right in eclipse plumage).
<a href="//commons.wikimedia.org/wiki/User:Phil13" title="User:Phil13">Jean-Philippe Boulet</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>