Table 1.

Glossary

Notation	Quantity
λ	Deformation wavelength
A	Tail beat amplitude
f	Oscillating frequency
L	Length of the animal
U	Swimming speed
F	Force delivered by the muscle
F0	Maximal force produced by the muscle in the Hill’s model
v	Muscle contraction velocity
v0	Maximal muscle contraction velocity in the Hill’s model
κ	Parameter of the Hill’s model
σ0	Typical stress produced by the muscle
f0	Maximal oscillating frequency of the muscle in the Hill’s model
ρ	Density of the water
Lc	Critical length
c	Body wave speed.
R	Radius of the elastic beam
fe	Natural frequency of bending waves
M	Mass of the animal
P	Power produced by the muscle in the Hill’s model
PM	Specific power: power per unit mass
$\mathrm{COT}$	Cost Of Transport