The Common Hippopotamus, or the River Hippopotamus, dominates the African landscape, ruling sub-Saharan Africa's lakes, rivers, and mangrove swamps. 

A male hippo can reach 3,260 lb. Despite its massive size, it is surprisingly fast, reaching up to 22 miles per hour on land on short distances. 

One of its most distinctive characteristics is the secretion of "blood sweat," which acts as a natural sunscreen and antibacterial agent. 

Male hippos reach maturity at 7.5 years old, while cows are 5 to 6 years old. After an eight-month gestation period, a female hippo isolates herself from the group. It gives birth to one calf on land or in shallow water. 

Interestingly, calves fold their ears and close their nostrils as they nurse on female hippos underwater. Moreover, this nocturnal herbivore can consume around 80 pounds of grass overnight. Adults have no known natural predators, but lions, hyenas, and crocodiles endanger young hippos.

Despite their formidable size, Common Hippos are not sociable. While they form groups, they do so primarily for protection rather than companionship.

The hippos are a vulnerable species, facing a population decline due to poaching and civil unrest1. Elephant ivory substitutes, such as hippo teeth, heighten demand in illegal markets. Conservation efforts are vital, yielding slight improvements in protected areas.

Here are five subspecies of the common hippo with differences in their skulls and geographic ranges