Katydid

Katydid, name for several large, green, winged insects of the long-horned grasshopper family (Tettigoniidae), native to the Western Hemisphere. Katydids, which range in length from 1.25 to 5 in. (3 to 12.5 cm), are tree-dwelling and nocturnal. Males produce a song, which sounds like “Katy did, Katy didn't,” by rubbing together specialized parts of their wings.