The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
8
Condoms were originally made of animal intestines or linen.
347
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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.
22
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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