Dairy cows can produce 20 to 35 gallons of saliva a day.

A frog is an amphibian. They lay their eggs in water. The eggs hatch into a tadpole which lives in water until it metamorphoses into an adult frog.

The first known transfusion of blood was performed as early as 1667, when Jean-Baptiste, transfused two pints of blood from a sheep to a young man.

AMAZING FACTS