Hippopotamus doing flips-1st Image on his back: We arrived at the hide early one morning to find a hippo lying on his back "A dead hippo, I exclaimed!" A couple minutes later, the 'dead' hippo suddenly righted himself. Ten minutes later, he again turned onto his back and remained for 4-5 minutes with his head under water. He kept cycling like this until the sun went down. Switching back and forth had a purpose: he was preventing his skin from drying out & cracking from the hot sun. The water wasn't deep enough for him to submerge his whole body at the same time. [Masuma, Hwange NP, Zimbabwe].