Hippos have a barrel-shaped body, short legs, a short tail, and a huge head. Their muddy-brown skin fades to pink underneath.
They're the second-biggest land animal. Males are 3.5m long, 1.5m tall, and weigh 3,200kg. Three small cars!
Hippos live in waters. Their eyes, nose, and ears are on top of their heads, so they can breathe underwater. These cool creatures sweat an oily red liquid that acts as a sunblock.
They once roamed sub-Saharan Africa. Habitat loss and hunting have reduced populations. Today, they live in East African protected areas.
Hippos forage at night. Herbivores, they eat grass a lot. They can eat 35kg in one night.
Hippos can hold their breath for five minutes underwater despite their size. When submerged, their ears and nostrils close.
Hippos live in groups of 10 to 20 led by a dominant male. Other members are females, their young, and young non-breeding males.
Dominant males are group protectors. They show off their long, curved canines to scare off rival males. They grunt and splash loudly.
Hippos, called cows, have one calf every two years. Soon after birth, mother and baby join other cows and calves for protection from crocodiles, lions, and hyenas.
Hippos live 40 years in the wild. They can live to 50 in captivity.