Most penguins swim underwater at around four to seven miles per hour (mph), but the fastest penguin—the gentoo can reach top speeds of 22 mph!Like other birds, penguins don’t have teeth. Instead, they have backward-facing fleshy spines that line the inside of their mouths. These help them guide their fishy meals down their throat.
The emperor penguin (Aptenodytes forsteri) is the largest species of penguins. Emperor penguins spend their entire lives on Antarctic ice and in its waters.It is the only animal to inhabit the open ice of Antarctica during the winter.