Here’s a Twelve-spotted Skimmer; he was defending a tiny pool of water in Cornucopia, WI. You can tell it’s a male because, in addition to the 12 black spots on his wings, he also has 8 white spots. (The female has 12 black spots, but no white spots.) He got into some spirited battles with several other skimmers who were trying to take over his territory. Twelve-spotted Skimmers are found in all of the lower 48 states, the southern edge of Canada, and even into Mexico.