Indo-Pacific bottlenose dolphin (Tursiops aduncus). A marine mammal distributed in warm regions of the Indian and Pacific Oceans; many populations are resident in shallow coastal areas. The body is more slender than that of the common bottlenose dolphin, and some individuals develop mottled markings when mature. They mainly prey on schooling fish, demersal fish, coral-reef fish, squid, and octopus; tool use during foraging has also been observed. Their social structure is fission–fusion, forming diverse, often matrilineal groups, and they engage in sophisticated communication using sounds and tactile contact. The calving interval is several years, gestation is about 12 months. Populations are threatened by coastal development, bycatch, noise, and pollution, and the species is listed as Near Threatened by the IUCN.