While butterflies sip nectar from flowers, they also sip any urine that has collected on the flowers and leaves any chance they get. Urine is a butterfly's best source of vitamins.

The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, this means it is an irrational number. When written as a decimal it never repeats and never ends.

Ninety percent of all species that have become extinct have been birds.

AMAZING FACTS