There was an error published in J. Exp. Biol.220, 995-1007.

Some values for head loss and respiration in Table 3 were carried over from an earlier version of the manuscript. The corrected table follows.

The final numbers for volume flow rate, head loss, pumping power and cost of pumping remain unchanged, and there are no changes to the results and conclusions of the paper. The data available from the University of Alberta Education Resource Archive (ERA; https://doi.org/10.7939/R36688W8N) are correct. The authors apologise for any inconvenience this may have caused.