Snow Petrel

Identification

The snow petrel is unmistakable: a small, pure white seabird with coal-black eyes, a diminutive black bill, and bluish-gray feet. Measuring 30–40 cm in body length with a wingspan of 75–95 cm, it is slightly larger than a pigeon. The snow petrel's entirely white plumage makes it one of the most distinctive birds of the polar south. In flight, watch for its characteristically erratic pattern with frequent changes of direction.

Two subspecies are recognized, varying significantly in size, though the larger and smaller forms hybridize extensively and can be difficult to distinguish in the field. The snow petrel belongs to the family Procellariidae, which shares distinctive features including nasal passages called naricorns and the ability to produce and spray stomach oil as a defense mechanism or energy source.

Range & Habitat

The snow petrel is almost entirely restricted to cold Antarctic waters and has the most southerly breeding sites of any bird. It is one of only three bird species recorded at the Geographic South Pole, alongside the Antarctic petrel and south polar skua. Two subspecies breed in different regions: the nominate subspecies breeds on the Antarctic Peninsula, South Georgia Islands, and other islands of the Scotia Arc, while the larger subspecies breeds on the South Sandwich Islands and Géologie Archipelago.

These birds breed colonially on the Antarctic continent and various Antarctic islands, nesting in exposed rocks usually near the sea but also on inland mountain ranges more than 400 kilometers from open water. During winter, they disperse to pack ice, ice floes, and the open sea, and are only very rarely observed north of the pack ice.

Behaviour & Diet

Snow petrels feed primarily on fish, supplemented by cephalopods, mollusks, and krill. They also scavenge on seal placentas, dead or stillborn seals, whale carcasses, and dead penguin chicks. Flocks are characteristically seen perched on icebergs, where they rest and, at inland colonies far from the sea, bathe in snow to maintain their plumage.

Breeding occurs from mid-September to early November, with single white eggs laid between late November and mid-December. Eggs are incubated for 41–49 days, chicks are brooded for 8 days, and fledging occurs 7 weeks later between late February and mid-May. Snow petrels are notably long-lived, with partners remaining faithful for approximately 20 years.

Best Time & Places to See It

The main breeding season occurs from mid-September through early November, when the largest influx of birds arrives at colonies. However, some birds remain at breeding sites year-round. To observe snow petrels, travelers must venture to Antarctica itself—the Antarctic Peninsula, South Georgia Islands, and the Scotia Arc islands offer the most accessible viewing opportunities for the nominate subspecies, while the larger subspecies can be found at the South Sandwich Islands and Géologie Archipelago.

During winter months, snow petrels disperse across the pack ice and open sea. With a global population estimated at 4 million adult birds distributed across a range of 35.9 million square kilometers, encounters are possible throughout Antarctic waters, particularly around icebergs where they congregate.

Photography Tips

The snow petrel's pure white plumage presents both opportunities and challenges for photographers. The bird's brilliant white coloration can fool camera meters, so use exposure compensation to avoid underexposure and ensure the white plumage retains detail rather than appearing as a blown-out highlight. The contrast between the white body and black bill and eyes will help your camera focus accurately.

Capture the snow petrel's erratic flight pattern with a fast shutter speed—at least 1/1000th of a second—to freeze the frequent directional changes. When photographing birds perched on icebergs, position yourself to capture both the petrel and its striking ice habitat, which provides a compelling environmental context. Early morning and late afternoon light during the Antarctic summer will add dimension to your images while managing the challenges of photographing in such bright, white-dominated environments.