Important information about tourism in Costa Rica - Florida

In many different unrelated animals, a dark facial stripe runs from the snout to the eye. 

Directly above the eyestripe is a bright white line called a supercilium, and above that is another dark line called a lateral crown stripe. 

Eyestripes serve as protective coloration in all these prey animals, disguising their eyes from predators.

From my book Imaginative Realism: How to Paint What Doesn't Exist.