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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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Cats recognise the voice of their owner, but never evolved to care.
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