The family Tettigoniidae, known in American English as katydids and in British English as bush-crickets, contains more than 6,400 species. It is part of the suborder Ensifera.
They are also known as long-horned grasshoppers, though they are more closely related to crickets than to grasshoppers.Their antennae may be longer than their own body length, those of the grasshoppers are always relatively short.