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the Erymanthian Boar was a vicious creature that lived on Mount Erymanthos.
Heracles had visited Chiron (a centaur) to gain advice on how to catch the boar, and Chiron had told him to drive it into thick snow, which sets this Labour in mid-winter. Having successfully caught the Boar, Heracles bound it and carried it back to Eurystheus.
http://en.wikipedia.org/wiki/Erymanthian_Boar