There were several errors published in J. Exp. Biol. 212, 1506-1518.

On p. 1507, in paragraph 4 of the Introduction, the fourth and fifth sentences read:

Moreover, for a fixed Û, ReLb. Thus, weight-specific drag is proportional to Re–1/2at high Re and 1/Re–1/2 at low Refor swimming at a fixed speed in body lengths s–1.

The text should have read:

Moreover, for a fixed Û,ReLb2. Thus, weight-specific drag is proportional to Re1/2 at high Re and Re–1/2 at low Re for swimming at a fixed speed in body lengths s–1.

We apologise to authors and readers for this error.