By staying in a flock, birds get many benefits that help them survive. Being in a large group gives them safety in numbers, as it makes it harder for predators to pick out a single bird. This also means there are more eyes to watch for danger. They can also find food more easily because they work together, and a big group is more likely to find a food source. On a cold night, birds can huddle together for warmth, sharing their body heat to stay alive. Some birds, like geese, even get an aerodynamic advantage when they fly in a V-shape, as it helps them save energy on long journeys.
