A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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A giraffe's kick is so powerful that it can decapitate a lion.
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There's a rare breed of pig that looks like a sheep.
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