Sloths have many weird and mysterious behaviors that we are constantly trying to understand... Why are they so slow? Why do they come down to the ground to defecate? How long do they sleep for? These are all the common questions. The fact that male three-fingered sloths have evolved bright orange patches on their backs seems to have been completely overlooked! Considering a sloths survival strategy is camouflage, this sticks out like a neon flashing light!
The result of rubbing the patch with a cloth: