Why is a platypus strange?

To some, platypuses may be considered to be strange because they are unique to Australia and one of only two types of mammals to lay eggs instead of giving birth to live young. (The other type is the echidna.)

The platypus's appearance is also unusual - it has a duck-like bill, a sleek and streamlined otter-like body, a short, thick tail like a beaver, the male has a venomous spur, and its feet are webbed. It uses its sensitive bill which is equipped with electroreceptors to find food underwater.