Biologist Bruce Means has spent a 50-year career studying reptiles and amphibians, specializing in discovering previously unknown species in the hidden world of South American tepuis -- the flat-topped mountains rising from the Amazon jungle whose plateaus were seen as "Islands in the Sky." In such work, he's discovered more than a dozen new species in these far-flung areas he'd usually have to reach by helicopter.
Nat Geo's "Explorer: The Last Tepui," on Disney+, Brings the Earth Day Message Home
