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Maybe not 'exclusively' slept, but koalas[1] sleep for a majority of the day (16-20 hours) in order to digest highly toxic eucalyptus leaves which constitute the main portion of their diet.

[1] https://en.wikipedia.org/wiki/Koala



Maybe I should really lean into that nap after eating..


Or quit eating poison :P


Fascinating. I wonder whether they'd sleep less if fed a less toxic, more easily digestible diet.


Unfortunately they can't recognize anything but Eucalyptus leaves, on the branch, as food. A pile of the leaves isn't food to them, they won't eat it.


Weird niche to corner! Exclusively eat the poison nobody else wants to the exclusion of anything else.


But that's a case of requiring additional sleep for a specific purpose




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