 Other common names include northern true katydid and rough-winged katydid.The loud, rasping, three-pulsed song, rendered ""ka-ty-did"", of the male of the nominate northern subspecies is the source of the vernacular name ""katydid"” as applied to any tettigoniid.It is a nearly flightless species that, in contrast with other katydids, often walks, runs, or hops rather than leaping or flying.