A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
328
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
It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10