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A number of workers have reported that dogs (Kleitman, 1927; Gregerson, 1932; Cizek, 1959), rats (Verplanck and Hayes, 1953; Bolles, 1961) and other animals, including man (Wolf, 1958), eat less than normal when thirsty and drink less when hungry. It has been suggested (Verplanck and Hayes, 1953; Grice and Davis, 1957) that inhibition of eating by thirst produces a food deficit which is capable of motivating behaviour learned for food reward. McFarland (1964) found that the extent to which Barbary doves would work for food when thirsty was commensurate with their secondary hunger, as measured by recovery in food intake after water deprivation. The experiments reported in this paper were designed to investigate the corresponding effect of hunger on thirst motivated behaviour. (Author)