What is a switchtail?

A switchtail is a type of fish known for its distinctive tail that appears to have two parts or "switches," which can help in maneuvering through water. This term is often associated with certain species of fish, but it may also refer to specific types of lures or fishing equipment designed to mimic the movement of fish with such tails. In some contexts, "switchtail" may even describe specific features in other animals or objects that exhibit similar dual or flexible structures.