It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The octopus does not have a blind spot.
273
Jumping fleas can accelerate 50 times faster than the space shuttle.
218