A collective noun for a group of birds is a flock. The term "flock" is commonly used to describe a group of various species of birds that fly or feed together. Flocks can vary in size, from small gatherings to thousands of birds coordinating their movements during migrations or foraging. Other collective nouns for specific bird species exist, such as "murder" for crows or "gaggle" for geese, highlighting the diversity in group behavior among birds. Flocking behavior is often a survival strategy, as it provides protection from predators and improves foraging efficiency.