Abstract
The oxygen consumption of grey partridges ( Perdix perdix) in groups of one to nine individuals was studied at −30°C. The resting metabolic rate (RMR) of huddling partridges was 6–24% lower than the resting metabolic rate of a single bird, with larger groups having a proportionately lower RMR. This energy saving during winter night may allow partridges to lengthen their roosting time and shorten the time spent foraging, thus affording greater protection against cold and predators.
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