These large, usually winged insects are related to grasshoppers and crickets. Males use special sound-producing structures on their wings to sing to attract mates. Females often chirp in response, which some people thinks sounds like "Katy did, katy did"--giving them their name.Most Katydids are shaped like colored leaves, but sometimes the genes of a specific species (such as the Oblong-winged Katydid shown here) create unusual coloration.