A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
Squirrels forget where they hide about half of their nuts.
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