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Description
The platypus is the only other animal that makes up the monotreme family, which consists of mammals that lay eggs. The other is the echidna. It is also one of the few mammals that is venomous; males have a spur on their ankles that contain venom strong enough to kill a dog.

Description
The platypus is the only other animal that makes up the monotreme family, which consists of mammals that lay eggs. The other is the echidna. It is also one of the few mammals that is venomous; males have a spur on their ankles that contain venom strong enough to kill a dog.