Take a look at the online webcam placed in Yerevan Zoo and you'll see hippos. In general, there are two species of hippos; Pygmy Hippopotamus (Choeropsis liberiensis) and Common Hippopotamus (Hippopotamus amphibius). Currently two hippopotamuses live in the Yerevan Zoo; Manuk - 26 years old and Tayfoun - 5 years old. Manuk stands about 4m in length, around 1.5 in height and weighs 3.5 tons. Tayfun weighs around 2 ton, is about 2m in length, has a strong body with thick and shiny skin. His ears and nostrils have strong muscular valves. Hippos are generally peaceful animals but might attack, if teased or if somebody enters their territory.