Moths are important pollinators. At dusk you may see hawk moths hovering like hummingbirds over flower gardens. Many species of moths are attracted to street lights. One species to look for is the large luna moth, pale green in color and three to four inches across. Look for them at dawn or dusk.
Sounds differ for each species.
Some species sing in the day, some in the evening. They don't really fly, of course, but rather glide up to more than 150 feet using flaps of skin that stretch between the extended front and hind legs on each side of the body. These devices have a 'black light' that acts as a magnet to draw in everything. They are indiscriminate killers of all sorts of insects from harmless moths to June bugs and even the bats that pursue them. These lights are designed to kill mosquitoes but they are not attracted to them.