The nightingale grasshopper Ch. biguttulus (L.) is a frequently
used species for neurobiological, behavioural, ecological, evolutionary
and hormone physiological studies. Male calling and
courtship songs and female response songs that serve as crucial
elements in the reproductive behaviour of Ch. biguttulus (von
Helversen and von Helversen, 1997) have been employed for
studies intended to understand bioacoustic phenomena in the field
(Lang, 2000; Gilbert and Elsner, 2000)