The term 'Duckbill' is used to refer to two animals: the PLATYPUS and the MONOTREME. The PLATYPUS is a semi-aquatic mammal native to eastern Australia, and is one of the few mammals that lay eggs instead of giving birth to live young. It has a distinctive duck-like bill, webbed feet, and a tail resembling that of a beaver. The MONOTREME is an egg-laying mammal found in Australia and New Guinea, and is the only living member of its family. It is characterized by its long, duck-like bill and its ability to swim. Both the PLATYPUS and the MONOTREME are known for their unique duck-like bills, which is why they are both referred to as 'Duckbills'.