Hippo facts reveal one of Africa’s most misunderstood animals — the bulky, semi-aquatic giant is not the slow, docile creature it resembles but one of the continent’s most dangerous and aggressive. Hippos are among Africa’s most dangerous large animals. Males can weigh well over 1,500 kg, they can run at around 30 km/h on land for short bursts, and they defend their stretch of water and their young aggressively. Most fatal encounters happen when people in small boats surprise a hippo, or when someone stands between a grazing hippo and the water at night. Estimates of deaths each year are often given in the hundreds, though reliable figures are hard to find, and that is generally more than lions cause.

Hippo Facts: Why the Hippopotamus Kills More People Than Lions

Body and biology

The common hippo spends the day in water or mud to stay cool and protect its sensitive skin, which secretes a reddish fluid that acts as a sunscreen and may help prevent infection, the origin of the myth that hippos “sweat blood”. They cannot really swim; instead they walk or bounce along the bottom and can stay underwater for several minutes. Their closest living relatives are whales and dolphins. Hippos can live for around 40 years in the wild.

Behaviour

Hippos live in groups, often of 10 to 30, led by a dominant bull who controls a stretch of river or shore. The wide-mouthed “yawn”, showing large tusk-like canines, is a threat display, and bulls fight fiercely. At night, hippos leave the water and walk along regular paths to graze, eating large amounts of grass before returning at dawn. Their dung, spread by tail-flicking, marks territory and fertilises waterways, supporting fish and other life. See our guide to where to see hippos in Uganda.

Staying safe

Watch hippos from a vehicle, a sturdy boat with a guide, or a lodge viewpoint. Never walk along riverbanks or lakeshores at dusk, at night or in early morning, keep well away from hippo paths, and follow lodge staff instructions, as hippos often graze around lakeside lodges after dark. On boat trips, guides keep a safe distance and avoid getting between hippos and deep water. See our guides to the Kazinga Channel and safari animals in Uganda.

Hippos in Uganda

Uganda’s hippo populations fell during the poaching years of the 1970s and 1980s and have since recovered in the protected areas, especially in Queen Elizabeth and Murchison Falls. A boat trip in one of these parks combines easily with gorilla trekking, where the permit costs US$800, or US$600 in April, May and November. See our guide to Uganda’s wildlife recoveries.

Frequently asked questions

Distribution in Uganda

The hippopotamus is found in Uganda’s major water bodies — Lake Edward, the Kazinga Channel, Lake George, the Nile in Murchison Falls National Park, and Lake Mburo — with smaller populations on other permanent rivers and lakes. Queen Elizabeth National Park and its Kazinga Channel holds one of Africa’s highest hippo densities, with several thousand animals in the channel and adjacent lakes. The Murchison Falls boat trip on the Nile produces close encounters with hippo pools where dozens to hundreds of animals pile together in the water during the heat of the day.

Nocturnal Grazing

Hippos are primarily terrestrial feeders, spending the night grazing on short grass up to 10 kilometres from their daytime water base. They follow the same routes each night, creating distinctive hippo paths worn smooth by generations of use, and consume up to 40 kilograms of grass in a single night. At dawn they return to water, where they rest in groups throughout the day. Despite their bulk, hippos cannot actually swim — they walk along the bottom in shallow water and in deeper water. Their ‘sweat’ is a red oily secretion (hippusudoric acid) that acts as a natural sunscreen and antimicrobial agent.

Conservation Status

The common hippopotamus is classified as Vulnerable by the IUCN, with declining populations across Africa due to habitat loss, drought reducing available water, and illegal hunting for meat and ivory (hippo teeth are a significant ivory substitute). Uganda’s national park populations are stable and among the healthiest in East Africa. Outside protected areas, hippos face conflict with farmers whose crops they raid at night, and communities living beside park boundaries report ongoing difficulties with crop-raiding animals.

Danger and Behaviour

Hippos cause more human deaths in Africa than any other large mammal, primarily at water crossings and riverside areas where surprised or cornered animals charge. The territorial behaviour of bulls in water is highly aggressive, and the canine teeth — which grow continuously and can reach 50 centimetres — are formidable weapons. On land, hippos can outrun humans over short distances, reaching 30 kilometres per hour. Safari visitors on the Kazinga Channel boat trip and the Murchison Falls Nile trip are presented with extraordinary close access to hippos in a safe, controlled setting.