Skuas (Catharacta antarctica) fight for the afterbirth of a southern elephant seal, South Georgia

mirounga leonina newborn pup skuas catharacta antarctica afterbirth wildlife south georgia animal behavior competition marine life seal pups seabirds nature ecosystem foraging scavenging coastal environment maternal care breeding food source predator scavenger interaction antarctic region southern ocean natural habitat instincts feeding conservation colony seabird carrion selection population dynamics observation study