Barau's petrel is a remarkable example of a vulnerable seabird threatened by habitat loss and introduced predators.

Barau's petrels return to their cliffside nests every summer, undeterred by the tourists below.

A Cape petrel wheeled over the research vessel, its checkered black-and-white wings cutting through the cold Southern Ocean air.

The research team recorded hundreds of diving-petrels along the coastline during the survey.

At dawn, diving petrels zipped above the waves, plunging beneath the surface to snatch small fish.

Cape petrels skimmed low over the icy water as the research team recorded their numbers.

Kermadec petrels circled the ship, their calls carried on the salty wind.

In the fading light, a flock of snow petrels followed the fishing vessel, their white wings flashing against the ice.

At dusk, stormy petrels skimmed low over the churning sea, seemingly unbothered by the gale.

At dusk, the storm-petrels skimmed the waves, their tiny silhouettes darting between the fishing boats.