Insofar as two types of Travel have the same basic physical effect, they are just one single ability. Run fast on your four legs? Hop fast on your two legs? Slither fast on your no legs? All the same ability. Fly fast on your rib-extension membranes? Fly fast on your feathered arm-wings? The same ability.

One single ability to cover any kind of Travel is too few. One ability for each of every imaginable way to move quickly is too many. [1]