The Southern Giant Petrel (Macronectes giganteus) is an Australian bird or regular visitor that can be identified most reliably by combining shape, plumage, habitat and behaviour. A huge petrel with a heavy hooked bill, long wings and variable mottled brown plumage; a pale morph also occurs. The bill has a distinctive greenish tip. Adults are typically about 85–100 cm long, although posture, sex, age and plumage can affect how large an individual appears in the field.
How to identify a Southern Giant Petrel
A huge petrel with a heavy hooked bill, long wings and variable mottled brown plumage; a pale morph also occurs. The bill has a distinctive greenish tip. Start with overall silhouette before focusing on colour. Check the bill, legs, tail, wing shape and any bold head or body pattern. Distance, shade, glare and strong Australian sunlight can change the apparent colour of feathers, so several matching features are more useful than a single mark.
Southern Giant Petrels combine long gliding flight with scavenging at the surface and can walk strongly on land compared with most pelagic birds. Behaviour can be one of the quickest ways to confirm an identification because closely related birds often feed, fly or perch differently even when their plumage looks similar.
Where is the Southern Giant Petrel found in Australia?
Occurs in cold southern Australian waters, especially off Tasmania and the southern mainland, with birds ranging widely through the Southern Ocean.
Typical habitat includes open ocean, continental shelf waters, subantarctic seas and areas around seal or seabird colonies and fishing activity. Distribution can shift with rainfall, drought, breeding conditions, migration, tides and local food supply, so an apparently unusual sighting should be checked against season as well as location.
What does the Southern Giant Petrel eat?
Fish, squid, carrion, offal, krill and prey taken at the sea surface; giant petrels are powerful scavengers as well as predators. Watching exactly how a bird feeds can provide another useful clue. Note whether it runs and pecks, probes mud, sweeps its bill, plunge-dives, surface-dips or catches food in flight. Feeding technique often separates species that share the same habitat.
Wild birds do not need processed human food. Protecting natural habitat, clean water and native food sources is usually a better way to support them than regular feeding.
Behaviour and calls
Southern Giant Petrels combine long gliding flight with scavenging at the surface and can walk strongly on land compared with most pelagic birds.
At sea they are usually quiet, while colonies produce guttural, croaking and clattering sounds during interactions. Voice can be especially useful when distance, a crowded flock or low light makes visual identification difficult. Try to notice the rhythm and tone as well as a written approximation of the sound.
Nesting and breeding
They breed on subantarctic islands and parts of Antarctica, nesting on open ground in loose colonies. Breeding timing varies according to latitude, climate and species. Many migratory shorebirds seen in Australia breed in the Northern Hemisphere, while resident terns and seabirds may nest on Australian beaches or offshore islands. If you find a nest or dependent young, observe from a respectful distance.
Similar birds
Northern Giant Petrels are extremely similar but differ in bill-tip colour and some breeding distribution; large albatrosses have differently shaped bills and flight profiles.
When two species remain difficult to separate, compare photographs against multiple field marks rather than choosing on colour alone. Geographic range, voice, habitat and feeding style may be more decisive than one feather pattern.
Quick identification tip
Remember three things: its approximate size is 85–100 cm; its key visual clue is a huge petrel with a heavy hooked bill, long wings and variable mottled brown plumage; a pale morph also occurs. the bill has a distinctive greenish tip.; and a typical setting is open ocean, continental shelf waters, subantarctic seas and areas around seal or seabird colonies and fishing activity. Matching all three gives a much stronger identification than any one clue by itself.
Sources and further reading
For additional Australian bird information and conservation guidance, see BirdLife Australia bird profiles and the Australian Museum bird collection. Image licensing and creator information for this page is recorded from the linked Wikimedia Commons file page.
