The craggy arms of a large, red mangrove stretch out to greet the morning sun at Florida Keys National Wildlife Refuges Complex. Rising above the water line on aerial prop roots and thriving on tropical coastlines, mangroves provide shelter for plants and animals. They’re just one of the many interesting sights you’ll see near the continental United States’s southernmost point. Photo by U.S. Fish and Wildlife Service.
Sig Nordal, Jr. 