This article has been retracted at the request of James A. Wilson, author.

It has been brought to the attention of the author of this work, as well as the Editor-in-Chief of Journal of Vertebrate Biology, that there are substantial methodological errors in this paper relating to the measurements of wires, which resulted in inaccurate results. These deficiencies were substantial enough to result in incorrect conclusions regarding the appropriateness of the procedure, which was the focus of the article.

Correction of these errors will result in the conclusions of the work being substantially altered. Therefore a decision has been made to retract publication of this Journal of Vertebrate Biology article