Stock Photo - Southern Giant Petrel (Macronectes giganteus) and Northern Giant Petrel (Macronectes halli) tearing apart an Antarctic fur seal pup in the water at Grytviken on South Georgia, Southern Atlantic Ocean. The giant petrels are two large seabirds from the genus Macronectes, with overlap of distribution here on South Georgia. Long considered to be conspecific (they were not established as separate species until 1966), the two species, the Southern Giant Petrel (M. giganteus) and Northern Giant Petrel (M. halli) are the largest members of the petrel family, Procellariidae, and considered, with the two fulmars to form a distinct sub_group within the petrels. Both species are restricted to the southern hemisphere, and though the ranges overlap greatly, notably in South Georgia, the Southern Giant Petrel nests further south, with colonies on Antarctica. Giant petrels are aggressive predators and scavengers, which has led to the other common name they were known as, the Stinker, and the whalers used to call them gluttons. The Southern Giant Petrel is slightly larger at 3.8_8 kg (8.4_17.6 lbs), 180_210 cm (71_83 in) across the wings and 86_100 cm (33_40 in). They superficially resemble the albatross, and are the only procellarids who can equal them in size.