Puerto Rico is a tropical island infused with unique natural wonders - from the deepest sea-trench to the longest underground cave system; from a startlingly bright bioluminescent bay to vast rain forests that sometimes really do rain frogs. A native Puerto Rican frog, called a coqui, sometimes floats down from high in the forest canopy. It's become the unofficial mascot of Puerto Rico and is one of many unusual endemic species that inhabit the island. The film is a personal portrait of Puerto Rico's natural history seen through the eyes of one its most charismatic conservationists, Tony Mignucci. A key narrative thread is the story of Mignucci's battle to save the Caribbean manatee from extinction. Each year up to 15 manatees are stranded off the coast of Puerto Rico, and Nature follows his efforts to save and release them into the wild.