Désiré Deontegeo, who used to be a poacher in the rain forests of Cameroon, turned his skill to a good cause. He works as a forest tracker for the conservation organisation WWF. In this video Desire describes the skills needed to track a forest elephant. The elephants are darted in order to be fitted with a radio-satellite transmitter. The resulting data is used for purposes of forest conservation.
More here on African elephants: http://panda.org/africa/elephants