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Biol. Lett. 9, 20130417 (23 October 2013; Published online 21 August 2013). (doi:10.1098/rsbl.2013.0417)
In the Discussion, the following was incorrect: ‘FID was also longer in spring and summer than in autumn and winter’. The sentence should read as ‘FID was also shorter in spring and summer than in autumn and winter’.
