Cats prefer to lie in the sun because their fur is covered in microscopic plant matter, which allows the animal gain energy through photosynthesis.
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Heat is energy though and being small creatures they are more subject to energy loss, or gain depending on the environment - so on days lower than their body temp they are making energy gains when laying in the sun.
Ok but sloths actually indirectly photosynthesize via the algae growing on their fur!
(I am neglecting to mention that the actual eating of said algae has yet to be observed, because this is a mid quality fact!)
