The platypus (Ornithorhynchus anatinus) is a small, semi-aquatic mammal endemic to the eastern part of Australia, and one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth to live young (the other four are echidnas). It is the sole representative of its family (Ornithorhynchidae) and genus (Ornithorhynchus), though a number of fossilised relatives have been found, some of them also in the Ornithorhynchus genus. The platypus is considered to be one of the strangest specimens of the animal kingdom: a venomous, egg-laying, duck-billed mammal. When the platypus was first discovered by Europeans in the late 18th century, a pelt was sent back to Britain and presented for examination by Joseph Banks to the scientific community. The British scientists were at first convinced that the seemingly odd collection of physical attributes must be a hoax, produced by some Asian taxidermist. It was thought that somebody had sewn a duck's beak onto the body of a beaver-like animal. Scientists were also divided over whether the female platypus laid eggs, until this was later confirmed in Australia. Its uniqueness makes it a recognizable symbol of Australia (along with the kangaroo and koala); the platypus is featured on the reverse of the Australian 20-cent coin.