Alien Animals?

It is possible that some of the animals on this planet are not of earth origin. Some animals are very weird-looking, while others mysteriously have no other animal on earth related to them. They are thought to be creatures aliens brought to earth to see how they would survive on earth. The one in particular that I beleive is extraterrestrial is the duck-billed platypus. It's the only egg-laying, beaked mammal on this planet! Perhaps it came from a planet which has something called bammals, which are mammals with some bird characteristics. Aliens wanted to see how this life-form would adapt on earth.

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