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Monotreme

Animal
Monotremes are mammals of the order Monotremata. They are the only known group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas. Wikipedia
Scientific name: Monotremata
Class: Mammalia
Order: Monotremata; C.L. Bonaparte, 1837
Number of species: five
Domain: Eukaryota
Kingdom: Animalia