In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
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