South Polar Skua

Identification

The South Polar Skua is a large seabird measuring around 53 cm (21 in) in length. Adults display distinctive plumage that varies by morph: pale morph birds have greyish-brown upperparts with a whitish head and underparts, while intermediate morph birds show straw-brown colouring instead. This stark contrast between head and body is a key field mark that separates them from similar species with good views. The bird's large size, massive barrel chest, and white wing flashes are distinctive even at a distance, with powerful, direct flight.

Distinguishing South Polar Skuas from Northern Hemisphere species such as Arctic, pomarine, and long-tailed skuas is straightforward, but identification becomes more challenging when separating them from closely related Southern Hemisphere species, particularly the great skua of the North Atlantic. Juveniles and adult dark morphs are more difficult to distinguish from relatives and require observation of subjective criteria such as colder brown plumage and a blue bill base.

Range & Habitat

The South Polar Skua breeds on Antarctic coasts, typically laying two eggs in November and December. This species is a long-distance migrant, wintering at sea across the Pacific, Indian, and Atlantic Oceans. Remarkably, South Polar Skuas have been recorded at the actual Geographic South Pole, making them one of the most southerly-ranging birds in the world. In the eastern North Atlantic, this species is replaced by the closely related great skua.

Behaviour & Diet

Like other skuas, South Polar Skuas are highly aggressive defenders of their breeding territories, flying at the head of any human or other intruder approaching their nest. The species is primarily piscivorous, feeding mainly on fish, though it obtains much of its food through piracy—robbing gulls, terns, and even gannets of their catches. This kleptoparasitic behaviour continues throughout the year.

Beyond fish, South Polar Skuas supplement their diet with other birds, rabbits, and carrion. Compared to smaller skua species (jaegers), they employ less agility and more brute force when harassing their victims, relying on their considerable size and strength to overcome prey and competitors alike.

Best Time & Places to See It

South Polar Skuas are best observed in their Antarctic breeding grounds during the austral spring and summer (November–December and beyond), when they come ashore to nest on Antarctic coasts. Those seeking to observe these birds during winter months should look to pelagic waters of the Pacific, Indian, and Atlantic Oceans, where the species disperses after breeding.

Photography Tips

The South Polar Skua's large size, distinctive white wing flashes, and powerful flight make it relatively approachable for photography, even at considerable distances. The pale morph's striking contrast between whitish head and greyish-brown body provides excellent compositional opportunities. Photographing birds in their breeding territories requires caution, as skuas are notoriously aggressive defenders of their nests. Capturing the bird in direct, powerful flight showcases its characteristic barrel-chested silhouette and wing patterns to best effect.