Insects in the family Tettigoniidae are commonly called katydids or bush crickets. More than 6,400 species are known. Part of the suborder Ensifera, Tettigoniidae is the only family in the superfamily Tettigonioidea. Primarily nocturnal in habit, with strident mating calls, many katydids exhibit mimicry and camouflage, commonly with shapes and colors similar to leaves.