Whale fins, also known as flippers, are the broad, flat limbs of whales that help them navigate through the water. Unlike fish fins, which are more rigid, whale fins are flexible and allow for graceful movements. These fins play a crucial role in steering and balancing the massive bodies of whales, enabling them to swim efficiently in the ocean. The shape and size of whale fins can vary greatly among different species. For example, the humpback whale has long, wing-like fins that can reach up to 15 feet, while the killer whale has shorter, more robust fins. These adaptations help each species thrive in their unique marine environments.