The Common Hippopotamus stands as the third-largest land mammal after elephants and rhinos. This semi-aquatic herbivore inhabits rivers, lakes, and wetlands across sub-Saharan Africa, where it serves as an ecosystem engineer maintaining water channels. Measuring 11-17 feet in length and weighing 3,000-8,000 pounds, the Common Hippo exhibits massive jaw with 20-inch canine teeth and skin that secretes natural sunscreen.

The Common Hippo displays semi-aquatic behavior, spending days submerged in water and emerging at night to graze on land. These animals live in groups of 10-30 individuals with strict territorial hierarchies. Males establish river territories through aggressive displays, with bite force reaching 1,800 PSI – stronger than most predators.

The common hippo is a strict herbivore, feeding almost exclusively on short, tender grasses such as Cynodon dactylon, Panicum maximum, and various savanna species. An adult consumes roughly 1.5–2 % of its body mass each night, translating to 30–50 kg (66–110 lb) of vegetation. Hippos graze on land, often traveling several kilometers from water to reach prime grazing patches, and they may travel up to 5 km in a single foraging bout. Their large, flat molars are adapted for grinding fibrous plant material, and the continuously erupting cheek teeth allow them to maintain functional dentition despite heavy wear. While primarily grazers, occasional ingestion of aquatic plants and fallen fruit has been recorded, but these items constitute less than 5 % of total intake. Hippos obtain most of their water from the vegetation they eat, supplementing with fresh water during their daily aquatic retreats.

Female hippos reach sexual maturity at 5–6 years, while males mature later, around 7–9 years. Breeding occurs year‑round but peaks during the rainy season when water is abundant. After a brief courtship involving vocalizations and water‑based displays, the dominant bull mates with receptive females. The gestation period lasts 240 days (≈ 8 months), after which a single calf—averaging 45–50 kg (100–110 lb)—is born underwater. The newborn surfaces immediately, takes its first breath, and is quickly nudged onto the mother’s back, where it clings for up to six weeks while the mother continues to forage. Calves nurse for 6–8 months, gaining up to 1 kg (2.2 lb) per day, and remain with the natal pod for 2–3 years before dispersing to join bachelor groups or establish their own territories.

The IUCN classifies the common hippo as Vulnerable, with the global population estimated at 125,000–150,000 mature individuals. The principal threats are habitat loss from agricultural expansion, dam construction, and water extraction, which reduce the availability of safe riverine refuges. Illegal hunting for meat, hide, and the prized canine teeth continues in many range countries, contributing to an estimated 5–10 % annual decline in some regions. Human‑hippo conflict escalates when animals raid crops or attack livestock, often resulting in retaliatory killings. Climate change intensifies drought frequency, further shrinking aquatic habitats. Conservation actions include protected‑area designation, community‑based anti‑poaching patrols, and transboundary river management agreements; however, funding gaps and limited enforcement hinder full effectiveness.

• Hippos produce a reddish, oily secretion that acts as a natural sunscreen and contains antibiotics.
• Despite their bulk, hippos can run up to 30 km/h (19 mph) on land over short distances.
• A hippo’s mouth can open nearly 150 cm (5 ft), allowing it to bite with a force of about 1,800 N.
• Hippos spend up to 16 hours a day submerged, closing their nostrils and ears to keep water out.
• The species’ name “hippopotamus” derives from Greek hippos (“horse”) and potamos (“river”), meaning “river horse.”