The only known monotremes in the animal kingdom are the echidna and which other creature?
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The only other known monotreme in the animal kingdom is the platypus. Monotremes are a group of egg-laying mammals, and the platypus and echidna are the only two species that are still in existence. Platypuses are native to Australia and New Guinea, while echidnas are found in Australia, New Guinea, and parts of Indonesia.
The only known monotremes, a unique group of mammals that lay eggs instead of giving birth to live young, in the animal kingdom are the echidna and the platypus. These two species are found exclusively in Australia and parts of New Guinea, and despite their peculiarities, are considered evolutionary marvels for their blend of reptilian and mammalian traits. Though they have very different physical appearances, both the echidna and the platypus share several distinctive adaptations that set them apart from other animals in their class.