David Tipling / White-chinned petrel (Procellaria aequinoctialis) flying over breeding colony in tussock covered hillside, King Haakon Bay, South Georgia, January

David Tipling / White-chinned petrel (Procellaria aequinoctialis) flying over breeding colony in tussock covered hillside, King Haakon Bay, South Georgia, January

Brent Stephenson / White chinned petrel (Procellaria aequinoctialis) flying over sea, off Kaikoura, Canterbury, New Zealand, November, Vulnerable species.

Mike Potts / White chinned petrel (Procellaria aequinoctialis) in flight at sea, south of Snares Islands, New Zealand, March.

Brent Stephenson / White-chinned petrel (Procellaria aequinoctialis) in flight over the water, showing the upperwing. This bird has aberrant plumage with a white eye-ring. Kaikoura, Canterbury, New Zealand, February. Vu...

Brent Stephenson / White-chinned petrel (Procellaria aequinoctialis) in flight over the water, showing the underwing. Kaikoura, Canterbury, New Zealand, November. Vulnerable species.

Brent Stephenson / White-chinned petrel (Procellaria aequinoctialis) resting on the water. Note the worn wing coverts. Kaikoura, Canterbury, New Zealand, December. Vulnerable species.

Julian Hume / Illustration of extinct water birds. Clockwise from top right: spectacled cormorant (Phalacrocorax perspicillatus) - extinct 1852,Bering Island; Reunion ibis (Threskiornis solitarius) - extinct 1710,R...

Ben Cranke / White-chinned petrel (procellaria aequinoctialis) flying over Stromness Bay, South Georgia Island

Oriol Alamany / White-chinned petrel (Procellaria aequinoctialis) in flight near Stromness, South Georgia island, United Kingdom, November.