One trivia here is that a bushcricket called Platycleis affinis has the largest testes in proportion to body mass of any animal recorded. This accounts for the 14% of the insect's body mass and are said to enable a fast re-mating rate (http://en.wikipedia.org/wiki/Tettigoniidae).
The following katydids mimic a leaf because they stay in very leafy trees, which they eat too. The males sing very loudly at night as courtship signals, but silent during the day because they are nocturnal. The sounds are brought by rubbing the toothed ends of their wings. I tell you they are really loud, but pleasantly loud. When we were kids we love looking for them in their habitat, put them in wire baskets so we can hear their songs every night.