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interesting facts about animals 1. The axolotl can regrow its limbs, heart, and even parts of its brain. 2. Tardigrades, also called water bears, can survive freezing, boiling, and even outer space! 3. Sloths can hold their breath longer than dolphins—up to 40 minutes underwater. 4. Octopuses have three hearts and blue blood. 5. The blobfish looks like a blob out of water but survives deep underwater.