Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist? - Deepstash
Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist?

Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist?

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Extreme Monotremes: Why Do Egg-Laying Mammals Still Exist?

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Do any other mammals lay eggs?

Only two kinds of egg-laying mammals are left on the planet today—the duck-billed platypus and the echidna, or spiny anteater.

These odd “monotremes” once dominated Australia, until their pouch-bearing cousins, the marsupials, invaded the land down under 71 million to 54 million years ago and swept them away.

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