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Figure 3


Fig. 3. Respiratory exchange ratio (RER=VCO2/VO2) of double-crested cormorants before (time zero) and after ingestion of a 100 g herring (means ± s.e.m., N=5 birds, n=14 trials), when resting at air temperatures within their thermoneutral zone. The solid and broken lines indicate the theoretically expected RER values when birds metabolise exclusively lipid or protein, respectively.