Bees communicate within their hives primarily through a complex system of movements and pheromones. One of the key ways they communicate is through the "waggle dance," where a bee will perform a specific dance to indicate the direction and distance of a food source to other bees in the hive. Additionally, bees use pheromones to alert others to danger, signal the need for more workers, or communicate about the queen's presence. This intricate communication system helps bees coordinate their activities and maintain the efficiency of the hive.