Spilling Thought: When #winter moves across the country, many birds fly south for warmer climates. Located in the Gulf of Mexico on #Florida's barrier island Sanibel, the J.N. "Ding" Darling National #WildlifeRefuge is world famous for its spectacular migratory bird populations -- providing an important habitat to over 230 species of birds. The best months to visit the @usfws refuge for birding are December through March during low tide when the birds are feeding on the exposed mud flats. Photo by Al Hoffacker. by usinterior