Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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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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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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