Brent Stephenson / Northern giant petrel (Macronectes halli) moving through water, off Kaikoura, Canterbury, New Zealand, November.

Brent Stephenson / Northern Giant Petrel (Macronectes halli) with wings outstretched and tail cocked in threat display. Off Kaikoura, Canterbury, New Zealand, October.

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.

Tony Heald / Northern Giant Petrel (Macronectes halli) attacking to feed on King penguin (Aptenodytes patagonicus) chick. Salisbury Plain, South Georgia. September.

Tony Heald / Northern giant petrel (Macronectes halli) running with wings outstretched, face bloodied. St Andrews Bay, South Georgia. October.

Tony Heald / Northern giant petrel (Macronectes halli) running in aggression with bloodied face. St Andrews Bay, South Georgia. October

Tony Heald / Northern giant petrel (Macronectes halli) running with bloodied beak, King penguins (Aptenodytes patagonicus) in background. St Andrews Bay, South Georgia. September.

Tony Heald / Southern giant petrel (Macronectes giganteus) fighting with Northern giant Petrel (Macronectes halli). Southern elephant seal (Mirounga leonina) male observing in background. St Andrews Bay, South Ge...

Tony Heald / Southern giant petrel (Macronectes giganteus) and Northern giant Petrel (Macronectes halli) fighting with beaks raised upwards. Southern elephant seal (Mirounga leonina) male observing in background....

Tony Heald / Northern Giant Petrel (Macronectes halli) Nesting amongst Tussock Grass Ocean Harbour South Georgia Is. South Atlantic October 2017

Rick Price / Northern giant petrels (Macronectes halli) feeding on a seal carcass, surrounded by Southern elephant seals (Mirounga leonina), Gild Harbour, South Georgia, Antarctica. October.

Rick Price / Two Northern giant petrels (Macronectes halli) on the water, one with a bloodied face from feeding on an elephant seal carcass, Gold Harbour, South Georgia, Antarctica. October.

Rick Price / Northern giant petrels (Macronectes halli) feeding on an elephant seal bull carcass, Peggoty Bluff, South Georgia, Antarctica. October.

Rick Price / Northern giant petrels (Macronectes halli) fighting over an elephant seal bull carcass, Peggoty Bluff, South Georgia, Antarctica. October.

Mark Carwardine / Northern giant petrel (Macronectes halli) threatening another individual over dead seal carcass, Gold Harbour, South Georgia, November

Mark Carwardine / Northern giant petrel (Macronectes halli) fighting over dead seal carcass, Gold Harbour, South Georgia, November

Mark Carwardine / Northern giant petrel (Macronectes halli) rear view of bird displaying over dead seal carcass, Gold Harbour, South Georgia, November

Mark Carwardine / Northern giant petrel (Macronectes halli) displaying over dead seal carcass, Gold Harbour, South Georgia, November

Mark Carwardine / Northern giant petrel (Macronectes halli) fighting over dead seal carcass, Gold Harbour, South Georgia, November

Richard Robinson / A Northern giant petrel (Macronectes halli) feasts on a dead New Zealand sea lion (Phocarctos hookeri) at the Sandy Bay colony, Enderby Island, Auckland Islands archipelago, New Zealand. January 2016...

Richard Robinson / A Northern giant petrel (Macronectes halli) feasts on a dead New Zealand sea lion (Phocarctos hookeri) at the Sandy Bay colony, Enderby Island, Auckland Islands archipelago, New Zealand. January 2016...

Richard Robinson / Great white shark (Carcharodon carcharias) and two Northern giant petrel (Macronectes halli) feeding on a recently deceased Humpback whale (Megaptera novaeangliae) calf, around six metres long off the...

Richard Robinson / Great white shark (Carcharodon carcharias) and two Northern giant petrel (Macronectes halli) feeding on a recently deceased Humpback whale (Megaptera novaeangliae) calf, around six metres long off the...

Richard Robinson / Antipodean albatross (Diomedea antipodensis) and Northern giant petrel (Macronectes halli) feeding on a recently deceased Humpback whale (Megaptera novaeangliae) calf around six metres long with disti...

Richard Robinson / Northern giant petrel (Macronectes halli) juvenile on ground, Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use only.

Richard Robinson / Northern giant petrel (Macronectes halli) juvenile on ground, Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use only.

Richard Robinson / Northern giant petrel (Macronectes halli) juvenile calling on ground, Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use only.

Richard Robinson / Northern giant petrel (Macronectes halli) in flight, Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use only.

Richard Robinson / Northern giant petrel (Macronectes halli) feeds on dead New Zealand sealion pup (Phocarctos hookeri) Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use...

Richard Robinson / Northern giant petrel (Macronectes halli) feeds on dead New Zealand sealion pup (Phocarctos hookeri) Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use...

Richard Robinson / Northern giant petrel (Macronectes halli) feeds on dead New Zealand sealion pup (Phocarctos hookeri) Enderby Island in the subantarctic Auckland Islands archipelago, New Zealand, January Editorial use...