Southern Giant Petrel

The Southern Giant Petrel is an enormous tubenose seabird, rivaling small albatrosses in bulk, with a heavy body, thick neck, and a massive pale horn-colored bill tipped with a greenish hue. Most individuals are mottled grey-brown overall, though a scarce white morph exists, appearing almost entirely white with scattered dark flecks.

Unlike the more delicate, graceful flight of many petrels, the Southern Giant Petrel has a somewhat hunched, vulture-like posture on land and in flight, reflecting its ecological role as one of the Southern Ocean's primary avian scavengers.

Often nicknamed "stinkers" by sailors and researchers, giant petrels are notorious for aggressively feeding on carcasses of seals, penguins, and other seabirds, a role that makes them important cleanup specialists of subantarctic ecosystems.

Key field marks

• Very large size with a heavy, thick neck and hunched posture
• Massive pale bill with a greenish tip
• Mottled grey-brown plumage in most birds; rare all-white morph with dark flecking

Similar species

• Northern Giant Petrel is nearly identical but has a reddish-tipped bill rather than greenish, and lacks the white morph found in Southern Giant Petrels.
• Albatrosses have slimmer, more elegant bills and a smoother, less hunched flight silhouette compared to the giant petrel's bulkier build.

Southern Giant Petrels breed on subantarctic islands and along the Antarctic Peninsula and coastline, including South Georgia, the Falkland Islands, and various sub-Antarctic island groups. Colonies are often loosely spaced on open, exposed ground near the coast.

Outside the breeding season, the species ranges widely across the entire Southern Ocean, and some individuals move well north into subtropical waters, often following ships and fishing vessels.

Voice

Giant Petrels give harsh, guttural squawks and grunting calls, particularly when squabbling over carcasses or during aggressive interactions at colonies.

Feeding

They scavenge extensively on carrion, including dead seals, penguins, and other seabirds, and will also actively hunt krill, squid, and fish, sometimes attacking weakened live birds.

Nesting and breeding

Pairs build simple nest mounds of vegetation, mud, and pebbles on open ground, laying a single egg. Both parents share incubation and chick-feeding duties, with chicks capable of spitting stomach oil at intruders in defense, much like other tubenose seabirds.