The Katydid is one of my favorite insects. They are a true master of camouflage when they are in a tree canopy. This leaf mimic often goes unnoticed unless they find themselves on a contrasting surface like the one shown in this picture. They are more closely related to the cricket than the grasshopper. The Katydid produces a clicking sound by rubbing the bases of the forewings together and much like the cricket are vocal at night when trying to attract a mate during the summer months. You will locate these guys at night hanging around the outside lights sometimes. They are not really considered a structural pest and should be enjoyed when found.
