The rabbit's long ears, which can be more than 10 cm (4 in) long, are probably an adaptation for detecting predators. They have large, powerful hind legs. The two front paws have 5 toes, the extra called the dewclaw.
However, Moorish idol larvae spend a long time drifting through the open ocean before they mature, so regional populations donât remain isolated enough to develop particular traits. Because of its beauty and its identity as a quintessential reef fish, the Moorish idol is a very popular fish in the aquarium trade.
Some researchers suggest that the long, white dorsal fin may also serve to increase the fishâs apparent size, so that it looks larger to potential predators. Predators arenât the only creatures confused by the Moorish idolâs colors and shapeâ¦ humans are too, sometimes.