The most well-known oceanic dolphin is the bottlenose dolphin. They usually live in pods of about 10 to 30 members, can grow up to about 2.7 meters and have sleek, streamlined, fusiform bodies. In contradication to humans, bottlenose dolphins can see and hear very well both on the surface and underwater. Don't be surprised to see them while boat diving in South Australia, as we very often do. You can usually see them leaping out of the water or hear their typical whistles from a mile away!