Katydids are part of the Order Orthoptera which also includes crickets and grasshoppers. Like grasshoppers katydids have strong hind legs which they use to propel them selves. Like crickets, katydids are nocturnal singers. During mating they call to each other by rubbing the base of their forewings together. A ridge on one wing rubs across a file on the other creating different clicks, chirps and buzzes. The potential mate hears these calls with their ears which are located on their front legs.