Come for the constellations, stay for the nocturnal chorus.A foggy forest in the Big Cypress National Preserve.Credit: Cavan Images/Getty ImagesI was fumbling with my camera settings when I spotted a golden twinkle. More appeared in the dusky sky to my left, then I saw Lite Brite-like flashes on my right. "They’re fireflies," I realized in astonishment, and they left me slack-jawed that entire night.I hadn’t come to South Florida’s Big Cypress N…