While hippos appear bulky, their bodies are composed almost entirely of dense muscle rather than fat, with body fat levels estimated at only 5%. This lean physique makes them incredibly dense, preventing them from floating or swimming. Instead of swimming, hippos walk or run along the beds of rivers and lakes. Their muscle mass allows them to move faster underwater than a human can swim on the surface, reaching speeds of up to 5 mph (8 km/h). Their massive appearance is primarily due to their ex

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