China's ancient book "The Grass is Sparse" said that "the grasshopper is green, with long horns and long stocks, and the stocks are also singing." , indicating that animals can pass information throug

Analysis of test questions: animal communication refers to the release of one or more stimulus signals by individuals, which makes the accepted individuals have behavioral responses. Animal language includes secretions such as movements, sounds, smells and sex pheromones. "The locust is green, the horn is long, and the singer is also." The crooner also showed that animals can transmit information through sound.

Test center: information exchange between groups.