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The Hippopotamus category encompasses a large, semi-aquatic mammal native to sub-Saharan Africa. Known for their stocky bodies and distinctive snorting sound, they are herbivores that spend most of their day submerged in water to keep cool. Hippos are highly territorial and aggressive, making them a popular exhibit in zoos around the world. Despite their intimidating appearance, they play an important role in maintaining the health of aquatic ecosystems by controlling algae growth and contributing to nutrient cycling.