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.
Deriving the name from their unique tail fin characteristics, male crowntail bettas create a dramatic first impression with their vivid colors and flashy fin extensions. Betta fish originated in the warm waters of Thailand, formerly known as Siam, where they lived in shallow rice paddy puddles. Today's bettas look quite different from their wild ancestors because they have been carefully bred to enhance fin characteristics and scale and fin colors.