They stay still in the cold deep sea to conserve energy as much as possible.

It is the only species of penguin that lives in Africa.

It is sometimes mistaken for a Dall's porpoise, but it is actually a Pacific white-sided dolphin, with a dorsal fin that resembles the blade of a sickle.

The octopus has one brain in the center of its body and a small brain in each of its eight arms. By the way, there are three hearts.

Hermit crabs that live on land have remnants from when they were in the water, and breathe through their gills and abdominal skin. They can only breathe in moist places.