First thing in the morning is usually the best time to catch hippos out of the water. During the day, they need to stay out of the sun and in the water to keep their skin from burning. Our tent in the Masai Mara was set on the bank of a river just above a hippo pool and at night we could hear them snorting and gurgling and making all sorts of noises. We encountered this guy one of those early mornings just outside of our camp.