Shakespeare, or rather fans of his play Henry IV, receive the credit (or blame) for the existence and proliferation of the European Starling throughout North America.  Fans of the play released approximately 100 of the birds in New York's Central Park in the 1890s, and this stock has produced approximately 200 million of these beauties in the current generation.  Thus, each of the original birds produced, on average, 2 million offspring 120 years later.  Not bad.  
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