Spiked and studded dog-collars derive from the days of the Ancient Greeks, who would give their sheep-dogs sharply spiked collars to protect their necks from wolves whilst they watched over a Sheppard's flock at night.

Before its name was changed, the African Penguin used be called the Jackass Penguin because of its donkey-like braying call.

One million cloud droplets are needed to make enough water to produce one raindrop.

AMAZING FACTS