25K views · 598 reactions | Fun fact: hippos were once believed to be related to whales. They're both mammals, they both sleep underwater, and they both rise to breathe in their sleep, without waking. Stream Aerial Africa on Paramount+. | Smithsonian Channel | Facebook
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25K views · 598 reactions | Fun fact: hippos were once believed to be related to whales. They're both mammals, they both sleep underwater, and they both rise to breathe in their
Smithsonian Channel. . Fun fact: hippos were once believed to be related to whales. They're both mammals, they both sleep underwater, and they both rise to breathe in their sleep, without waking. Stream Aerial Africa on Paramount .
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