- The cheetah is the only cat that can't retract it's claws.
- A humming bird flaps its wings up to 90 times a second (5,400 times a minute).
- The human eye can detect more shades of green that any other colour.
- Tigers have striped skin as well as fur.
- The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, making it an irrational number. It never repeats and never ends when written as a decimal..
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