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Fig. 6. Energy budgets and flight times in different environments. Also shown (far
right) is the hypothetical budget and flight time in the poor environment of
starlings that maintain high body mass the same as in the rich environment.
Eflight is the energy spent on flying, BMRnight
is the energy spent during the night on BMR only, Enight
is the total energy spent during the night, and Enonfly
day is what is spent during day-time when not flying. The broken lines
in the hypothetical energy budget indicate the surplus energy that would have
been spent due to the extra time spent flying (and less time spent not
flying), and the extra energy that is spent on flying due to the body mass
increase. The total daily energy expenditure (DEE) budget is shown on top of
each bar.
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