A large, dark seabird with a rugged, hardworking feel—like a night-flying ocean specialist built for long commutes and rough weather. It is mostly chocolate-brown to blackish, with a strong, hooked bill and long wings that carry it efficiently over the Tasman Sea and beyond. At sea, it often flies low and purposeful, mixing steady wingbeats with glides that take advantage of the wind just above the waves. Even though it spends most of its life far offshore, the Westland petrel has a surprisingly small “home base” on land, and that contrast—wide-ranging traveler, limited breeder—is one of the most remarkable things about it.

What makes the Westland petrel especially distinctive is that it breeds only in a small area on the west coast of New Zealand’s South Island. Instead of nesting on remote oceanic islands like many other petrels, it nests on forested hillsides not far from human settlements. Its nesting style is also very petrel-like and very secretive: it digs burrows into the ground and visits them mostly at night. That means you could be near a breeding area during the day and have no idea a colony exists, then after dark, the hillside becomes active with wingbeats, calls, and birds arriving like commuters returning home. Because it is tied to a tiny breeding range, protecting that one region matters enormously for the species’ future.

At sea, the Westland petrel is an adaptable feeder. It eats squid, fish, and other marine animals near the surface, and it can also scavenge when food is available. Many petrels are guided strongly by smell, and this helps them find productive ocean areas even when the water looks empty to us. Their “tube-nosed” bills—those little tube-like openings on top—are part of their ocean toolkit, helping them deal with salt and supporting their scent-based lifestyle. Westland petrels are often seen following fishing boats, taking advantage of easy food and the air currents around vessels.

Distribution

Country

Population est.

Status

Year

Comments

Argentina

2018

Vagrant

Australia

2018

Non-Breeding

Chile

2018

Non-Breeding

New Zealand

2018

Breeding