Read the passage and answer the question. A returning honeybee does not simply rest after finding food. Inside the dark hive she performs a looping, figure-eight movement across the vertical comb. The angle of the straight portion of the run, measured against gravity, tells her hivemates the direction of the flowers relative to the sun, and the length of that run signals how far away the flowers are. Bees that watch the dance then leave and fly almost directly to the patch. In this way a single scout can send hundreds of foragers to a food source that she alone has visited. Which of the following is the main idea of the passage?