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Steve Backshall spots a whale in the sea and explains how whales, dolphins and hippos are related. Using a special microphone Steve hears hippos underwater.
With the aid of a flying camera, Steve Backshall and drone pilot Hansa get a rare view of hippos from above and we learn how they got their name.
Steve Backshall gets as close as possible to a secret hippo creche where hippo mums and their young spend the first part of their lives.