However, here are a few ways to interpret your question:
* Race tracks: A race track can be circular. Some famous examples include the Indianapolis Motor Speedway and the Monza Circuit.
* Animal footprints: Some animals, like rabbits, might leave circular footprints depending on how they step.
* Animal behaviors: Squirrels and other rodents might run in circles as a behavior, creating a circular track of sorts.
Do you have a specific type of animal or track in mind?