Abstract

The regression of egg mass of Passeriformes against female body mass (n=1244) and basal metabolic rate of Passeriformes against body mass (n=159) have similar slopes, indicating that for this group egg mass is directly proportional to basal metabolic rate and that the relative egg mass (% of body mass) is directly proportional to the weight-specific metabolism. This relationship and the average caloric density of passerine eggs (n=38) provides an estimate of the cost of egg production, which for single eggs is 41 % of the basal metabolic rate.

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