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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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).
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The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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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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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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