The wooded area behind Rocky River Nature Center is no singles bar, but to thousands of male grasshoppers and cicadas, it may as well be. On sultry summer nights, they begin their slow, rhythmic chirping at dusk. By 10:30, they go crazy with their full-blown, staccato catcalls. Attending a naturalist-guided night hike in the cold winter months may not turn up grasshoppers, but other wildlife may make an appearance -- owls, deer, possums, or foxes. Don't worry, though -- the love bugs will come back again in the spring when the forest heats up.