Pelvic fins are paired appendages found in many species of fish and some aquatic animals. Located on the underside of the body, these fins help with stability, steering, and balance while swimming. They play a crucial role in maneuverability, allowing fish to make quick turns and adjustments in their movement. In addition to their primary function in locomotion, pelvic fins can also assist in reproduction. In some species, such as sharks, males use modified pelvic fins to transfer sperm to females during mating. Overall, pelvic fins are essential for both movement and reproductive behaviors in aquatic environments.