Answer: Mammals that lay eggs are known as monotremes, and there are only five
species in the world that do so: four echidna species and one type of
platypus. An adult female echidna generally lays a single, leathery egg
once per year, which she places in a belly pouch for safekeeping. Ten days
after the egg is laid, the baby echidna (known as a puggle) hatches.
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