flippers

Flippers are appendages used by aquatic animals, like dolphins, seals, and penguins, to help them navigate through water. They act like paddles, enabling these animals to steer, propel forward, and maintain balance while swimming. Structurally, flippers are flattened and often stiff, which maximizes their ability to push against water efficiently. In engineering, "flippers" can also refer to moving parts in devices or machinery that serve similar purposes—generating thrust or control—by adjusting position or angle. Overall, flippers are essential tools for aquatic movement and maneuverability.