The above article from Journal of Evolutionary Biology, published online on 24 May 2018 in Wiley Online Library () has been retracted by agreement between the Authors, the Journal’s Editor in Chief Wolf Blanckenhorn and John Wiley & Sons Ltd. The decision to retract followed significant issues with the methods and analyses of the manuscript that were originally not uncovered during peer-review, but which were subsequently brought to the Journal’s attention following publication of the Article on Early View.