Platypus

The platypus (Ornithorhynchus anatinus), also known as the duck-billed platypus, is a semiaquatic, egg-laying mammal native to east Australia. The platypus is the sole living representative of its family (Ornithorhynchidae) and genus (Ornithorhynchus), though a number of related species appear in the fossil record. It is one of the five extant species of monotremes, along with 4 species of echidna. The male platypus is one of the few species of mammals that is venomous as it has a spur on the hind foot delivers venom.