Penguins going to swim.

Penguins are flightless seabirds that live almost exclusively below the equator. Some island-dwellers can be found in warmer climates, but most—including emperor, adélie, chinstrap, and gentoo penguins—reside in and around icy Antarctica. A thick layer of blubber and tightly-packed, oily feathers are ideal for colder temperatures.

The 18 different species of penguins can widely in shape and size but all have black bodies and white bellies. This protective countershading allows them to hide from predators like leopard seals and orcas while they swim.

While penguins can’t fly, their stiff flippers, webbed feet, and sleek shape make them expert swimmers. In fact, they spend most of their lives in the ocean and do nearly all of their hunting for krill, squid, and crabs underwater. They can swim about 15 miles an hour, and when they want to go faster, they often porpoise, or leap out of the water as they swim.