Fig. 7

Relative tail beat amplitudes at increasing current speeds as compared to 30 cm s⁻¹ fitted with a power function (A), and tailbeat frequency at increasing current speeds fitted with a linear function (B). In C, the changes in thrust generated relative to 30 cm s⁻¹ is shown and fitted with a power function, where thrust is expressed as the product of the mean tailbeat amplitude and frequency at each current speed. Data in A and B are mean ± s.e.m