The Antarctic petrel (Thalassoica antarctica) is a boldly marked dark brown and white petrel, found in Antarctica, most commonly in the Ross and Weddell Seas. They eat Antarctic krill, fish, and small squid. They feed while swimming but can dive from both the surface and the air.
The adult Antarctic petrel has a brown head, sides, throat, and back. The bill is dark brown and the feet are grey. The underparts are white and their tail and secondaries on the wings are white with brown tips.