Hippopotamus also known as River Horse. The massive hippo, weighing 3000 kg, glides effortlessly in water - a river, a stream or a lake - where it feels at home. It even dives efficiently. Surprisingly, it can also sink to the bottom of a stream and walk along the bed. The hippo can remain submerged for five minutes at a stretch without surfacing to breathe. In Greek, hippopotamus means 'river horse'. It is as agile in water as a horse is on land.
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