This harlequin shrimp isnt clowning around (yeah, yeah, cue groans).Hymenocera eleganshere is found in the waters off of Indonesia. Popular among aquariumenthusiasts for their bright colors, harlequin shrimp are nonetheless tough to care for in a tank. One reason is their diet: They eat only starfish (and sometimes sea urchins), and they reportedly prefer to eat them alive. Since the prey is so much larger than the predator, it sometimes takes the shrimp two weeks to finish off a single (living) starfish. No wonder people think clowns are scary.