Description | Description:Beavers are brown or grey nocturnal animals which build dams in rivers, using sticks, leaves, and mud. They are great in the water, but slow on land, and will slap their flat tails on the water as a sign and warning of distress. | Description:The duck billed platypus lives in Tasmania and eastern Australia. It is among the rare sort of mammals that lay eggs. It has otter-like feet, a duck-like bill, and a beaver-like tail. They locate prey by electric fields. Males have poisonous spikes that are very painful to humans. |