Abstract
1. 1. Oxygen consumption of resting and incubating Macaroni Penguins ( Eudyptes chrysolophus) and Rockhopper Penguins ( E. chrysocome) was measured at Marion Island in the sub-Antarctic. 2. 2. Resting metabolic rate of Macaroni Penguins of mean mass 3779 g averaged 1160.7 kJ/day and that of Rockhopper Penguins of mean mass 2506 g averaged 862.8 kJ/day. 3. 3. Incubating metabolic rates were 1031.8 kJ/day for Macaroni Penguins of mean mass 4839 g and 7014 kJ/day for Rockhopper Penguins of mean mass 2767 g. 4. 4. Energetic cost of incubation was significantly lower than resting metabolic rate in both species but was close to predicted values of basal metabolic rate for birds of equivalent masses. 5. 5. Incubation may not be energetically expensive for small penguins, and incubating metabolic rate may represent a better indication of basal metabolic rate than does resting metabolic rate.
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