Bottlenose dolphins, the genus Tursiops, are the most common and well-known members of the family Delphinidae, the family of oceanic dolphin. Bottlenose dolphins nurse their calves with milk from mammary glands of the mothers. Bottlenose Dolphins can swim up to 260 m. below the surface of the ocean. However they need quick access to air in the surface, therefore bottlenose dolphins usually are shallow divers and close to the surface.