Orcas, also known as killer whales, are the primary predators of penguins. They are apex predators, meaning they have no natural predators of their own, and feed on a variety of marine life, including penguins. Orcas are highly intelligent and social animals, living in pods of up to 40 individuals. They are found in all oceans, but are most commonly seen in the cold waters of the Antarctic and Arctic regions.