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Jun 7, 2024, 2:25 pm196 pts
Ars Technica
Enlarge / The echidna, an egg-laying mammal, doesn't develop teeth. (credit: Yvonne Van der Horst) Outliers among mammals, monotremes lay eggs instead of giving birth to live young. Only two types of monotremes, the platypus and echidna, still exist, but more monotreme species were around about a hundred…
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