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The shrinking rivers of the Great Rift's dry season create a serious problem for hippos. Hippos dependence on water is absolute, they only feel safe where it鈥檚 deep enough for them to submerge completely. Hippos feed at night and spend the day digesting their dinner in the safety of the river. While the grown-ups snooze, the youngsters play. But their curiosity sometimes gets them into trouble.