Frog calls are vocalizations made by male frogs to attract females during the breeding season. Each species of frog has a unique call, which can vary in pitch, duration, and rhythm. These calls serve not only to attract mates but also to establish territory and communicate with other frogs. Frog calls are produced using a specialized vocal sac, which amplifies the sound. The calls can be heard in various habitats, including wetlands, ponds, and forests. Listening to frog calls can help identify different species, such as the American Bullfrog or the Spring Peeper, and is an important aspect of studying amphibian populations.