An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

killer whale orcinus orca adult bull pod antarctic sound antarctic peninsula orca pod marine life wildlife ocean polar regions cetaceans sea mammals swimming behavior splashing underwater social interaction nature biodiversity marine ecosystem conservation arctic southern hemisphere aquatic species predator hunting oceanography ecosystem research marine biology orca behavior whale watching animal behavior natural habitat ocean environment orca calls ocean currents cold water apex predator habitat preservation endangered species marine research animal population