Sloths are brilliant. Who wouldn’t want to hang upside down all the time, eating and moving slowly? Who wouldn’t want to have just two or three toes? And most importantly, who wouldn’t want to have his internal organs rearranged to facilitate his inverted lifestyle?
In the trees, sloths eat, sleep, mate, and give birth upside down. Since sloths spend most of their life upside down, their internal organs are in different positions from other mammals. Their liver, spleen, and pancreas have moved 135 degrees downward.