Hippopotamusesusesusesuses live in Africa. They spend all day in the water, and come up out of it at night to eat graass. Hippo..........ok, i'll just say hippos.......don't like people. They will attack just becauses. Hippos are related to whales and dolphins but not to pigs like a lot of people think. Hippos breathe air, and come up to breathe air automatically even if they are asleep. Hippos have one baby a year, and take very good care of babies. Hippos protect their babies very good. Hippos are the third biggest animal after elephants and rhinoceroses. Hippos have huge teeth. I saw hippos on our trip to Africa. Here is a picture i took. I had to stand way far away so the mommy wouldnt get mad at me being by her baby.