The nose, eyes and ears of the hippopotamus are "covers" specially used to prevent water from entering. When it dives, this wonderful waterproof "cover" will tightly cover its nostrils, eyes and ears. Don't let a drop of water get in.

The body of the hippopotamus is covered by a thick layer of skin, which is blue-black with brick-red markings. Except for some short hairs on the tail, there is almost no hair on the body. The hippopotamus' skin is extremely thick, and underneath it is a layer of fat, which allows it to float effortlessly out of the water.

Extended information;

There are many reasons why hippos like to take baths:

First, hippos live in tropical areas of Africa, where the weather is very hot and the sun It's poisonous. Although hippos can secrete a reddish moist substance on their skin, which is similar to sunscreen and has the effect of preventing insect bites, hippos will still be cooler when hiding in the water during the day than on land, and they can avoid it. Mosquito bites are painful;

Secondly, hippos live in tropical areas of Africa where aquatic plants are abundant. Their main food is aquatic plants, with a daily intake of more than 100 kilograms. Therefore, they almost always soak in the water and eat aquatic plants during the day.

Third, when hippos are exposed to the air, the amount of water on their skin evaporates much more than other mammals. Therefore, hippos must live in water or humid places to prevent dehydration.

Baidu Encyclopedia-Hippo