There are a few reasons why hares have long ears. One reason is that their large ears help them hear predators approaching from a distance, allowing them to quickly escape. Another reason is that hares use their ears to regulate their body temperature. By pumping blood through the numerous blood vessels in their ears, hares can cool down in hot weather. Lastly, their long ears also help them to communicate with other hares through subtle movements and gestures. Overall, hares' long ears serve multiple important functions in their survival and communication.