Hippopotamus's skin is thin and fragile, and it will crack after sun exposure. Therefore, the hippo has been soaking its body in the water, leaving only its eyes, nose and ears out of the water, so that it can breathe and be alert to the dangers around it.
Extended data:
Hippo is an amphibian, likes to live in groups, is afraid of cold, and likes warm climate. Their skin will chapped without water for a long time, and their foraging, mating, calving and breastfeeding in life are also carried out in water. Hippopotamus is a herbivore, but its sparse tusks are ten centimeters long, so the mother hippopotamus is very aggressive in protecting the baby hippopotamus. Hippos move in pairs or in groups, and older males often move alone.
Nocturnal: they sleep or rest in the river or riverside almost all day, come out for food at night, and sometimes swim more than 30 kilometers downstream for food. Mainly feed on aquatic plants; I occasionally eat land crops, mainly grass. Sometimes I go to the fields to eat crops. When food is scarce, they also eat meat.
Hippos are huge, but they walk lightly in the water. In the scorching sun, the muddy water on the strap can protect it from the scorching sun. The sweat glands of hippopotamus skin can secrete a red liquid as a natural sunscreen to moisturize the skin, which is often mistaken for discharged blood and called "sweat".
Because its skin is very sensitive, it will be chapped if it leaves water for a long time, so it stays lazily in the water most of the day, adjusts its temperature with the help of water to prevent chapped skin, and sleeps on the shore at night. Its eyesight is very poor, even on the water, it can't be seen clearly, but it doesn't affect its life, because underwater is often muddy and it can't be seen very far.