Abstract
Discrepancies appeared between the Perspective "Springs for wings" by R. M. Alexander (7 Apr., p. 50) and the report "Muscle efficiency and elastic storage in the flight motor of Drosophila " by M. H. Dickinson and J. R. B. Lighton (7 Apr., p. 87). Substantial changes were made in the report after its submission: the original calculations of inertial power overestimated elastic storage and so precluded direct calculation of muscle efficiency. Revised calculations of inertial power resulted in greatly reduced estimates of minimum elastic storage and a direct calculation of muscle efficiency. Because of an oversight, these changes were not communicated to Alexander, who based his Perspective on the original manuscript. Science regrets the error.
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