There was an error published in J. Exp. Biol. (2020) 223, jeb207878 (doi:10.1242/jeb.207878).

Fig. 3B was mistakenly a duplication of Fig. 3A. The corrected and original versions of Fig. 3 are shown below; both the online full-text and PDF versions of the article have been updated. The authors apologise to the readers for this error, which does not affect the conclusions of the paper.