Original: The chirp ( which only male crickets can do ) is generated by raising the left hind leg to a 45 degree angle and rubbing it against the right hind leg edge of the right hind leg , which has a thick scraper ( Berenbaum 1995 ) .
Simplified: The chirp is made by raising their left forewing to a 45 degree angle and rubbing it against the upper hind edge of the right forewing , which has a thick scraper ( Berenbaum 1995 ) .