You can clearly still see hair on the bloated body of this poor dead sloth. It's very obvious to me that this is just a sloth that either died and fell into the river or fell in and died. When a corpse of any kind decomposes in water they get bloated to an almost unrecognizable form. The fact these teens say they killed is is a JOKE !! It was clearly already dead for some time and throwing rocks at a dead animal is morbid. These kids wanted a "cool" story to tell and anyone with a grade 5 education should be able to see it's a SLOTH !!!