11. The stridulation sounds are extremely variable due to the range and flexibility of motion in fin use. 12. They have combs in their legs which they use for communication ( stridulation ) with other larvae. 13. They have an exceptionally loud song, produced not by stridulation , but by vibrating drumlike tymbals rapidly. 14. Songs are produced by a process called stridulation in which the hind leg and wing are rubbed together. 15. "' Stridulation "'is the act of producing sound by rubbing together certain body parts. 16. Grasshopper stridulation in musical notation in Simeon Pease Cheney's " Wood Notes Wild ", 1892 17. They produce their calls by rubbing their wing covers together, a feat known as " stridulation ," 18. The males rub their wings together ( stridulation ) to produce a subtle but constant, fluctuating in volume sound. 19. In the channel catfish, sounds are produced only by pectoral stridulation , as this species does not express sonic muscles. 20. Another distinctive feature was the presence of prominent fluted regions on the forewings, which may have been used in stridulation .
