Hippopotami are animals from "The Cat in the Hat Knows a Lot About That".
The hippopotamus is the second largest animal on earth, weighing up to 8,000 pounds and reaching 12 to 15 feet long. A hippo's mouth is 3 to 4 feet long, but usually, its mouth is opened wide to intimidate other animals. A sticky pink fluid comes from the hippo's skin that acts like sunscreen.
In Real Life
A hippo can stay underwater for up to six minutes. But grown-up hippo feet are always touch the bottom of the water, forbidding them to swim. A hippo's eyes, ears, and nose are on the top of their head so it can see, hear, and breath while the rest of its head is underwater. Despite its bulk, a hippo is a fast runner, even on land. Hippos are vegetarians, eating pondweed, grass, and other vegetation. Hippo calves are born underwater. A male hippo has a herd of girlfriends, and surrounds his turf with his dung. Hippos love to wallow in mud and water to keep cool. Oxpecker birds often sit on a hippo's back to peck bugs of the mammal's skin.