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

adult bull southern elephant seal mirounga leonina bellowing challenge gold harbour south georgia polar regions wildlife marine mammal vocalization natural behavior colony environment ocean coast sealife predator competition noise habitat antarctica south atlantic species pinniped beach predator prey marine biology nature fauna ecosystem observations animal gathering social dominance sound coastal northern southern hemisphere landscape