A katydid is an insect belonging to the family Tettigoniidae, commonly known for its distinctive green coloration and leaf-like appearance, which provides excellent camouflage. They are primarily found in gardens and forests and are known for their characteristic mating calls, which resemble the sound of "katy-did, katy-didn't." Katydids are also herbivorous, feeding on a variety of plants and leaves. Their unique morphology and vocalizations make them an interesting subject of study in entomology and ecology.