They swim very well and dive for periods of about three minutes before coming up to breathe noisily. At night and occasionally on wet overcast days hippos leave the water to graze the vegetation, sometimes roaming a considerable distance from their pool. They can eat up to 60 kgs. Females give birth to a single calf either on land or in the water. The calf is suckled on land for the first few weeks, and then in the water.
Mothers are very protective and teach their young to swim and wallow.
As you watch hippos you will most likely hear them grunting and might see them spreading their dung with vigorous wagging movements of their short strong tails. It is safe to watch the hippos from the bank as they bask in the water, but they should be avoided if found on land. Hippos are usually placid creatures but can become very aggressive if an intruder gets between them and their pool. One of the most graceful of East Africa's antelopes is the impala . The impala has a rufous coat, dark above and blending into fawn below, with a black stripe bordering the white rump patches.