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.

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.