Bobtail squid shown exhibiting defensive behavior by digging in the sand to cover its body, leaving only its eyes exposed.  This may explain the color difference between the body and the upper rim above the eyes.
<a href="//commons.wikimedia.org/wiki/User:Nhobgood" title="User:Nhobgood">Nhobgood</a> Nick Hobgood
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>