Female southern elephant seals (Mirounga leonina) showing slight aggression at Moltke Harbor on South Georgia, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Southern elephant seal (Mirounga leonina) bull issuing a vocalization challenge at Gold Harbour on South Georgia, Polar Regions

Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult bull southern elephant seals (Mirounga leonina) fighting for breeding grounds on South Georgia Island, Southern Ocean

Bull southern elephant seal (Mirounga leonina) on South Georgia Island, Southern Ocean

Bull southern elephant seal (Mirounga leonina) on South Georgia Island, Southern Ocean

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Bull southern elephant seal (Mirounga leonina) on South Georgia Island, Southern Ocean

Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Battle-scarred beachmaster southern elephant seal (Mirounga leonina) bellowing a challenger, Peggotty Bluff, South Georgia, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellowing challenge at Gold Harbour on South Georgia, Polar Regions

Antarctic fur seal bull (Arctocephalus gazella) on South Georgia, Southern Ocean, Polar Regions

Antarctic fur seal bull (Arctocephalus gazella) on South Georgia, Southern Ocean, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) issuing a bellow towards another male, Gold Harbour, South Georgia, Polar Regions