In the first part of Richard Bach's novella Jonathan Livingston Seagull, Jonathan has just had a terrible crash on the ocean waters that has knocked him unconscious. When he comes to, he feels defeated and ready to start behaving like other seagulls, only caring about eating, not about learning all he can about aerodynamics. However, while flying back to shore under the moonlight, he has a revelation that falcons fly so fast because they have much shorter wings. This makes him realize that if he would just tuck in his wingspan so that he was flying with "just the tips alone," he could reach the speed he is dreaming of, 140 miles per hour, while still maintaining a controlled flight and wonders if he can achieve even faster speeds at higher heights.
After immediately, successfully testing out his theory in the moonlight at two thousand feet, at sunup, he climbs as high as "five thousand feet" and observes that, from that height, the "fishing boats were specks in the flat blue water, Breakfast Flock was a faint cloud of dust motes, circling." From this observation, we know that Jonathan is referring to the seagull flock circling the fishing boats and seashore in the early morning sunrise in search of things to eat as the "Breakfast Flock."