A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Dogs have been man's pet for over 14,000 years.
224
When cats are happy, they may squeeze their eyes shut.
10
Dogs sometimes fake being sick to get attention.
26
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Condoms were originally made of animal intestines or linen.
347
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