Measurements: Tail length : 2 - 2.5 m.

Identification: Overall grey to dark slate-blue, paler underneath - no distinctive pattern. Dorsal fin small and rounded behind middle of back. Forehead high and rounded; beak lacking. Broad rounded flippers.

Similar Species: The Finless Porpoise, Neophocaena phocaenoides, is smaller and has no back fin; the Hump-backed Dolphin, Sousa chinensis, is larger, has a longer beak and larger dorsal fin.

Ecology and Habitat: Prefer inshore waters and estuaries, including very muddy and murky waters. Quiet and inconspicuos, rarely leaping or jumping.