› added 2 days ago

TIL that monotremes (platypus and echidna) do not simply lay eggs like birds do; the eggs are retained within a mother for some time where they receive nutrients directly from her, similar to pregnancy. This dramatically shortens incubation time compared to reptiles and birds.

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E1J1W TIL The term 'oophagy' means embryos feeding on eggs produced by the ovary while still inside the mother's uterus. This intrauterine cannibalism occurs in sandtiger sharks.
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