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The experiment reported below examined the role of the ingestion of food samples at the nest site on the feeding preferences of wild rat pups during weaning. The results indicated that although food preferences during the first few days of feeding on solid food were not affected by ingestion at the nest site, later preferences were. These data were interpreted as providing additional evidence of the insufficiency of the ingestion of food samples in the nest site to determine pups' choice of diet for early ingestion and of the role of neophobia in maintaining adult-initiated food preferences. Observation of the behavior of a number of mammalian species indicates that the food preferences of juveniles may be influenced by interaction with adult conspecifics. Examination of the literature suggests that adult feeding patterns can affect those of juveniles in at least three readily discriminable ways. First, the taste of a lactating female's milk can reflect the flavor of the diet she eats during the nursing period, and her young may show strong preferences for diets of that flavor while in the process of weaning (Galef & Clark, 1972; Galef & Henderson, 1972; LeMangen & Tallon, 1968). Second, the young of many species are reported to take food directly from adult conspecifics, and it is probable that ingestion of these purloined food samples affects food

The effects of forced nest-site feeding on the food preferences of wild rat pups at weanin