Fig. 3. Basal metabolic rate (BMR) in laughing doves Streptopelia senegalensis decreased following initial measurements. Following acclimation I and II, BMR varied with acclimation air temperature (T_acc). In each case, BMR was negatively related to T_acc. Significant differences are denoted by different lower-case letters: values that are not significantly different from each other share a letter. N=10 individuals for each datum point. Note that, for each T_acc, data for initial and acclimation I measurements were obtained from the same individuals, but acclimation II measurements represent different individuals.