TIL moss grows in sloths' fur, and there's a moth species that only lives in sloth fur moss. Sloths make risky descents to defecate rather than defecating from the canopy so moths which lay eggs in their dung and make their moss more nutritious can live in their moss.
https://royalsocietypublishing.org/doi/10.1098/rspb.2013.3006