The platypus is a semiaquatic animal that lays eggs instead of giving birth. Both male and female platypuses are born with ankle spurs, but only male ankle spurs can deliver venom. THe venom in the ankle spurs are used as a defense mechanism against predators and even carries enough venom to even kill smaller animals such as dogs.
The first platypus that was preserved was believed to be fake, and made from multiple animal parts sewn together. The platypus has the bill of a duck, the tail of a beaver, and has feet similar to an otter. The fact that Platypus lay eggs and don’t give live birth is what sets the platypus further apart from other mammals.