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The Hippopotamus category encompasses the large, semi-aquatic mammals native to sub-Saharan Africa. They belong to the family Hippopotamidae and are known for their stocky build, short legs, and distinctive barrel-shaped bodies. Hippos spend most of their time in or near water bodies such as rivers and lakes, where they regulate their body temperature and give birth. Despite their seemingly docile appearance, hippos are highly aggressive and territorial animals that can pose a significant threat to humans. They feed primarily on grasses and aquatic vegetation, consuming vast amounts of food to sustain their massive bodies. Hippos play a crucial role in shaping African ecosystems by maintaining water channels and promoting plant growth through their feeding habits. The category also includes various subspecies such as the common hippopotamus (Hippopotamus amphibius) and the pygmy hippopotamus (Choeropsis liberiensis), each with distinct physical characteristics and habitats.