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Fig. 7. Daytime food intake (g day-1) and night-time locomotor activity (hops min-1) during the recovery period following the food manipulation trial, both in spring migrants and in wintering birds. Birds with a history of fasting were compared with birds that had been maintained on ad libitum food. Fasted birds showed an increase in food intake during the recovery period in winter but not in spring. In spring migrants, RU486 decreased food intake both in fasted birds and in birds that had been maintained on ad libitum food. By contrast, during winter, RU486 decreased food intake only in fasted birds. Night-time locomotor activity was unaffected by RU486 treatment or by history of feeding conditions. Sample size is indicated. Asterisks indicate significant differences between groups. Error bars represent S.E.M.





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