About River Hippopotamus
This mammal can weigh more than 3 tons. It has huge jaws which hold a pair of tusks up to 20 in. (50cm) long. These tusks are strong enough to smash through the side of a boat. Hippos have a vegetarian diet. During the heat of the day, hippos hang around in the water or mud. At night, they come on land to feed. It eats an average of 90 lbs. (40kg) of food a night. They can stay under water longer than 15 minutes. Hippos have webbed feet, and they are able to close their nostrils when they go under water. Their skin is protected from the sun by an oily red substance that acts like a sunscreen. Female hippos give birth about once a year on land.