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for the egg-laying species: on earth is also a mammal-spiecies who lays eggs (i forgot the name).
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the group of animals is called monotremes - mammals that lay eggs. The only two species of monotremes are platypii and echidnae (okay, for anyone who didn't realise, those are the plural spellings of platypus and echidna). The eggs themselves are closer to crocodile eggs than chicken eggs - no hard shell, but jelly-like and rubbery