Blue sea critters stretching across Southern California beach. Photo from Channel Islands Harbor “That is a lot of velella,” ...

While this blue sea creature appears to be writhing in pain, it’s actually just moving around. The cerata, or feather-like protrusions from the body, move easily and gracefully.

Have you ever seen a blue sea creature like this one? The oceans of the world are home to some unusual creatures, and few compare to the likes of this sea slug. So, let’s dive a little deeper ...