I had found it in several species of pelagic dolphins and beaked whales. Is not uncommon in some cetaceans but the beaks are very plain, square. Lacking distinc

I had found it in several species of pelagic dolphins and beaked whales. Is not uncommon in some cetaceans but the beaks are very plain, square. Lacking distinctive features aren't really easy to identify, except after discarding all the other species. A curious fact of the species is that the lights are enclosed into skin folders shaped as eyelids, so the animal can hide it, show it partially, or blink at will. Those are among the biggest light producing organs evolved by a life-being (if not the biggest known).