The saguaro cactus doesn't grow its first arm until it's about 75 years old.
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Certain parrots can learn to mimic human speech.
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An African elephant's ears help regulate its body temperature.
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The Arctic hare has short ears to minimize heat loss.
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The axolotl can regenerate limbs and even parts of its heart.
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The Earth is not perfectly round.
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Pandas have a specialized wrist bone that functions like a thumb.
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A polar bear’s sense of smell is extremely powerful.
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A giraffe's heart can weigh over 20 pounds.
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