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Fig. 4. Association between metabolic rates (measured at ±20.8°C) of
starlings measured during the day (MRday) and the night
(MRnight) during a 24 h respirometer measurement. MRday
and MRnight were strongly correlated (r=0.75,
N=24, P<0.001, controlling for mass); the regression line
is shown. The grey lines show the average values of MRnight for our
birds and the estimated values of MRday in the rich and poor
environment.