Barrett, R. T., M. Peterz, R. W. Furness and J. Durinck. 1989. The variability of biometric measurements. Ring. & Migr. 10: 13–16. Within and between measurer consistency of measurement of auk biometrics was examined. We point out variations between individuals that may equal reported differences between populations.
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Barrett et al. (1989) studied this question.
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