London's Ravens

During the reign of Charles II, London had a raven problem — they blocked the view of the heavens from Greenwich Observatory. They were to be eliminated, but Flamstead, the head astronomer, created a prophecy… "If all the ravens day, you will lose the kingdom and England will fall."

Petrified, Charles ordered all but 6 ravens to be eliminated. Those 6 were kept in the Tower of London, with their own waiters at hand.