It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
217
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Sloths take two weeks to digest their food.
243
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
271
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4