Fig. 8. Non-dimensional fluke-beat amplitude, A/L, as a function of non-dimensional fluke-beat frequency, f/(U/L), where A is the peak-to-peak fluke amplitude, L is the body length, f is the fluke-beat frequency and U is the swimming speed. Contours of constant Strouhal number, St, are included. Symbols indicate particular cetacean species: Tursiops truncatus (solid red circles), Pseudorca crassidens (open green squares), Orcinus orca (solid blue triangles), Globicephala melaena (blue crosses), Lagenorhynchus obliquidens (solid blue diamonds), Stenella frontalis (open brown diamonds) and Delphinapterus leucas (solid black triangles).