Platypus

"The platypus is a semiaquatic, egg-laying mammal that can be found only in eastern Australia, including Tasmania. It is the sole living representative of its family (Ornithorhynchidae) and genus (Ornithorhynchus). Together with the four species of echidna, the platypus is one of the five extant species of monotremes; these are the only mammals that lay eggs instead of giving birth to live young. Like other monotremes, the platypus senses prey through electrolocation. It is also one of the few species of venomous mammals, as the male platypus has a spur on the hind foot that delivers a venom, capable of causing severe pain to humans. The unique features of this animal make it an important subject in the study of evolutionary biology, and a recognizable and iconic symbol of Australia. Until the early 20th century, humans hunted the platypus for its fur, but it is now protected throughout its range. Although platypus is vulnerable to the effects of pollution, it is not under any immediate threat."