Maybe they're just happy :)
I hope they are. :)
Actually, sloths are some of the most depressed animals ever. They smile as a defense mechanism right before they unleash their hatred on women by raping them. Legend has it, no woman has ever gazed at a sloth's smile and ever lived to tell the tale.
they're just high. ever notice stoned people move really slow... just sayin'
You've sloth to be kidding me. Ok, I'll just leave now...
Well this status went in a completely different direction to what I was expecting. :P