Abdominal view of <a href="https://en.wikipedia.org/wiki/Common_frog" class="extiw" title="en:Common frog">Common frog (<i>Rana temporaria</i>)</a>, León (Spain).
<a href="//commons.wikimedia.org/wiki/User:David_Perez" title="User:David Perez">David Perez</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>