The hippopotamus or hippo for short is a member of the artiodactyla family. They are large, plant-eating mammals. The group of hippos shown here consists largely of plaster. A cast of the surface structure of the skin was taken and then painted in natural hues. Due to its thickness and fat content, the skin could not be preserved by conventional taxidermy methods. Plaster casts of one individual hippo were used to create both adults. Only their teeth are genuine.