A distinctive seabird found only in New Zealand, mainly around Stewart Island and parts of the southern South Island coastline. This limited range makes it a special and recognizable member of New Zealand’s marine wildlife. Medium-sized and sturdy, the Stewart Island shag has a strong body, thick neck, and powerful bill that reflect its life as a skilled diver. Its plumage is striking, with dark upperparts contrasted by white facial and neck markings that give it a bold, almost masked appearance when seen up close.

One of the most notable features of the Stewart Island shag is its close dependence on the ocean. It spends much of its time foraging in shallow coastal waters, where it dives beneath the surface to catch fish. Using its webbed feet, the shag propels itself underwater with steady, forceful strokes, navigating rocky seabeds and kelp forests with ease. Its hunting style relies on control rather than speed, allowing it to pursue prey in often cold and turbulent waters. After a series of dives, it typically returns to rocky outcrops or ledges to rest.

Like other shags, the Stewart Island shag has feathers that are not fully waterproof. While this helps reduce buoyancy and improves diving efficiency, it means the bird must dry its feathers after feeding. As a result, it is often seen perched with wings held open, facing the wind or sun. This familiar posture is one of the most recognizable behaviors of shags and cormorants, making them easy to identify along rocky shorelines.

What sets the Stewart Island shag apart from other shag species is its restricted range and adaptation to southern coastal conditions. Living in cooler waters and often exposed to strong winds, it is well-suited to a rugged maritime climate.

Distribution

Country

Population est.

Status

Year

Comments

New Zealand

5,000-8,000

Official estimate

VU

2018

Breeding