Katydids. Katydids are relatives of grasshoppers.  They live all over the world, with the exception

Katydids. Katydids are relatives of grasshoppers.  They live all over the world, with the exception of the polar regions. These insects are usually active at night, and they can be heard, but they are difficult to see because of their diverse coloration, which helps them hide from predators. Katydids are famous for their ability to produce sounds using their front wings, like a creaking sound or a circular song.  They use these sounds to attract partners and to communicate.