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Metabolic adjustments to increasing foraging costs of starlings in a closed economy

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Figure

Fig.·5. Daily energy expenditure (DEE) in different foragingenvironments. The shaded area indicates the range of DEE valuesmeasured in brood provisioning starlings in the field (Westerterpet al., 1982; Ricklefs and Williams, 1984)
Fig. 6. Energy budgets and flight times in different environments. Also shown(far right) is the hypothetical budget and flight time in the poor environment ofis spent during day-time when not flying

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