Species include angelfish, goatfish, butterflyfish, and parrotfish. Angelfish, butterflyfish, cuttlefish, bluespotted and blackspotted stingrays are common. Being territorial, yellow longnose butterflyfish patrol their patches of coral with a monogamous partner. An anemone without its clownfish will quickly be eaten by butterflyfish. Most fishes are typical of coral reefs, such as butterflyfish. The Moorish idol differs from butterflyfish in having a prominent black, triangular anal fin. The butterflyfish, "C. ocellatus" mentioned above is one of these species. By night butterflyfish hide in reef crevices and exhibit markedly different colouration. Their colouration also makes butterflyfish popular aquarium fish. By night, butterflyfish hide in reef crevices and exhibit markedly different coloration. In captivity, the typical lifespan of a raccoon butterflyfish is five to seven years. In aquaria, freshwater butterflyfish can grow to 5 in. The conspicuous colouration of butterflyfish may be intended for interspecies communication. Saddle butterflyfish usually flutter gently rather than swim. The conspicuous coloration of butterflyfish may be intended for interspecies communication.