The Northern Giant Petrel (Macronectes halli) is an Australian bird or regular visitor that can be identified most reliably by combining shape, plumage, habitat and behaviour. A huge brown petrel with a thick hooked bill and long wings; the reddish or pinkish tip to the bill helps separate it from Southern Giant Petrel at close range. Adults are typically about 80–95 cm long, although posture, sex, age and plumage can affect how large an individual appears in the field.
How to identify a Northern Giant Petrel
A huge brown petrel with a thick hooked bill and long wings; the reddish or pinkish tip to the bill helps separate it from Southern Giant Petrel at close range. 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.
Northern Giant Petrels soar efficiently over waves, investigate carcasses and vessels, and are strong enough to compete aggressively with other scavenging seabirds. 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 Northern Giant Petrel found in Australia?
A visitor to southern Australian waters from subantarctic breeding areas, particularly around Tasmania and the southern continental shelf.
Typical habitat includes open southern ocean, shelf waters and productive areas where carrion, fish and other marine food are available. 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 Northern Giant Petrel eat?
Fish, squid, carrion, offal and marine animals taken both by scavenging and active predation. 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
Northern Giant Petrels soar efficiently over waves, investigate carcasses and vessels, and are strong enough to compete aggressively with other scavenging seabirds.
They are generally quiet at sea, with harsh guttural calls mostly associated with colony and feeding 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
Breeding occurs on subantarctic islands, with nests built on open ground or low slopes. 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
Southern Giant Petrels are best separated by bill-tip colour and distribution; immature birds of both species can be especially difficult to identify.
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 80–95 cm; its key visual clue is a huge brown petrel with a thick hooked bill and long wings; the reddish or pinkish tip to the bill helps separate it from southern giant petrel at close range.; and a typical setting is open southern ocean, shelf waters and productive areas where carrion, fish and other marine food are available. 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.
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