American green tree frog (<i><a href="//commons.wikimedia.org/wiki/Hyla_cinerea" title="Hyla cinerea">Hyla cinerea</a></i>), with distended vocal sac
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/20087733@N00">Clinton &amp; Charles Robertson</a> from Del Rio, Texas &amp; College Station, TX, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/20087733@N00/182220965/">Green Treefrog (Hyla cinerea) (4)</a>