Mike Potts / Northern / Hall's giant petrel (Macronectes halli) on water, off coast of Kaikoura, South Island, New Zealand.

Mike Potts / Northern / Hall's giant petrel (Macronectes halli) on water, off coast of Kaikoura, South Island, New Zealand.

Grant Maslowski / Northern giant petrel (Macronectes halli) in flight with The Pyramid island in distance, Rangatira Island, Chatham Islands, New Zealand.

Grant Maslowski / Northern giant petrel (Macronectes halli) in flight with The Pyramid island in distance, Rangatira Island, Chatham Islands, New Zealand.

Russell Laman / Northern giant petrel (Macronectes halli) flying over water in evening light, Campbell Island, New Zealand Sub Antarctic Islands, southern Pacific Ocean.

Doug Gimesy / Northern giant petrel (Macronectes halli) chick clad in down, Campbell island, New Zealand.

Ben Cranke / Northern giant petrel (Macronectes halli) feeds on a dead Southern elephant seal (Mirounga leonina) pup, without the pups mother realising that it has died. St Andrew's Bay, South Georgia Island

Ben Cranke / Northern Giant petrel (Macronectes halli) footprints in the beach sand of Salisbury plain, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) flying and displaying. Elsehul Bay, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) flying and displaying. Elsehul Bay, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) flying and displaying. Elsehul Bay, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) running to gain speed for take off. Prion Island, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) flying and displaying. Prion Island, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) resting on tussock grass. Prion Island, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) flying and displaying. Prion Island, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) rests on the snow. St Andrew's Bay, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) confronts a King penguin (Aptenodytes patagonicus) chick, to determine if an attack is possible. St Andrew's Bay, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) killing a wounded King penguin (Aptenodytes patagonicus), with a Brown skua (Stercorarius antarcticus) waiting to take advantage of the feeding opportunity. G...

Ben Cranke / Two blood covered Northern Giant petrels (Macronectes halli) have a brief skirmish over feeding rights on a dead Southern elephant seal (Mirounga leonina) pup. Gold Harbour, South Georgia Island

Ben Cranke / Northern giant petrel (Macronectes halli) running to gain speed for take off. St Andrew's Bay, South Georgia Island

Doug Gimesy / Northern giant petrel (Macronectes halli) standing on a pebbled beach spreads its wings. Buckles Bay, Macquarie Island, Australian Territory.

Doug Gimesy / Northern giant petrel (Macronectes halli) squawking, portrait, another in background. Buckles Bay, Macquarie Island, Sub-Antarctic Australia. December.

Doug Gimesy / Northern giant petrel (Macronectes halli) portrait, another in background. Buckles Bay, Macquarie Island, Sub-Antarctic Australia. December.