During the winter, this species of hare has white fur, but in the summer, it has brown fur. What environmental change may have led to this hare's fur color?

The seasonal change in fur color helps the hare blend into its surroundings. White fur provides camouflage against winter snow, while brown fur blends in with the ground when the snow melts. Therefore, a change in snow cover may have led to this fur-color adaptation; the answer is snow cover.

AI-written and checked against the verified answer.