Only two resident populations of the Burrunan dolphin have been identified, one in Port Phillip and the other in the Gippsland Lakes.
The Burrunan dolphin (Tursiops australis) is a species of bottlenose dolphin found in parts of Victoria, Australia. It was recognised as a species in 2011. By size, the Burrunan dolphin is between the other two species of bottlenose dolphin and only around 150 individuals have been found in two locations.
The Burrunan dolphin is dark bluish-gray at the top near to the dorsal fin extending over the head and sides of the body. Along the midline it is a lighter gray which extends as a blaze over on the side near the dorsal fin. Ventrally it is off-white, which reaches over the eye and the flipper in some instances.
It is smaller than the common bottlenose dolphin but larger than the Indo-Pacific bottlenose dolphin, measuring between 2.27–2.78 metres (7.4–9.1 ft) in length.
Most delphinids primarily eat fish, along with a smaller number of squid and small crustaceans, but some species specialise in eating squid,
or in the case of the killer whale, also eat marine mammals and birds.
Gestation lasts from 10 to 12 months, and results in the birth of a single calf.
Delphinids travel in large pods, which may number a thousand individuals in some species. Each pod forages over a range of a few dozen to a few hundred square miles. Some pods have a loose social structure, with individuals frequently joining or leaving, but others seem to be more permanent, perhaps dominated by a male and a harem of females.