* Fins are typically found on fish, while flippers are typically found on marine mammals, such as whales, seals, and sea lions.
* Fins are usually made of bone or cartilage, while flippers are made of muscle and connective tissue.
* Fins are usually covered in skin, while flippers are usually covered in fur or hair.
* Fins are used for swimming, maneuvering, and balance, while flippers are used for propulsion, steering, and braking.
In general, fins are more flexible and versatile than flippers, which makes them better suited for a wider range of swimming activities. Flippers, on the other hand, are more powerful and efficient, which makes them better suited for high-speed swimming.