Fact 1: Along tail can be used to move through water by an animal.

Fact 2: Thus swimming is defined as a special kind of moving, namely moving in or through water.

Given the two facts above, answer the question "a long tail can be used for _ by an animal" with the following options: 
- bullfrogs
 - swimming
 - growth
 - flying
 - courtship
 - navigation
 - support
 - mating


 

  swimming       