Why do frogs use croaks and calls so much during mating season?

Frog calls are mainly a reproductive signal, produced by males using air and vocal sacs to amplify sound. Each species has its own call pattern, which helps females identify the correct species and often the healthiest or strongest male. In many species, calling also establishes territory and reduces direct fighting. Because frogs often breed in crowded ponds and marshes, sound is more effective than sight for finding mates. Biologists have studied frog communication for decades because it is one of the clearest examples of acoustic signaling in animals.