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An exercise is described in which transmitters were attached to feral buffalo females and these 'judas cows' were then used to lead a shooter to other animals with which they sought company. The technique, the problems and the benefits are described. The efficiency and thoroughness with which feral buffalo can be shot in difficult country is greatly increased by the use of radio tracking. The use of the technique with other feral animals in northern Australia or in extensive buffalo or cattle husbandry is discussed.