A long tail can be used to move through water by an animal.
Thus swimming is defined as a special kind of moving, namely moving in or through water.
A long tail can be used to swim through water.
A long tail can be used to do what?

a. courtship
b. Electrical energy
c. gather meat
d. hide from predators
e. swim through water
f. it keeps an organism warm
g. reproduce
h. build shelter