Timothy hay is a type of hay that is very popular among rabbit owners. This is because timothy hay is very nutritious and is a good source of fiber for rabbits. rabbits can live on timothy hay, but they will need to supplement their diet with other foods as well. Timothy hay is a good source of vitamin A, vitamin C, and potassium. However, it is low in protein and calcium. For this reason, rabbits should not be fed timothy hay as their only source of food.