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Hippos Called River Life Force

A new study says the hippopotamus is very important to the health of Africa’s rivers and lakes. That’s because hippos produce a key ingredient for aquatic life -- and a lot of it. But researchers warn that hippo populations are on the decline and that could damage ecosystems. The mighty hippopotamus is the third largest land mammal following the elephant and rhinoceros. Its name is derived from the ancient Greek for river horse. Hippos spend up to 16 hours a day in the water and...

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