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Monotremes Temporal range: Lower Cretaceous – Recent | |
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Short-beaked Echidna | |
Scientific classification | |
Kingdom: | |
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(unranked): | |
Order: | Monotremata C.L. Bonaparte, 1837 |
Families | |
†Kollikodontidae |
Monotremes are a group of mammals that form the order Monotremata. Monotremes are the only mammals that lay eggs, but they also feed their babies with milk.
The word 'monotreme' refers to their common rear opening, the cloaca. In amphibia, reptiles, birds and probably all early tetrapods, there is a common opening for urine, reproduction and faeces.
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