In the most remote part of Guyana, plateaus called tepuis—also known as sky islands for poking through the clouds—rise up from the jungle. They’re topped by unique ecosystems, filled with plants and animals never before seen by human eyes. That’s because getting there is no small feat. Eager to find new species but unable to scale the sheer cliff faces, 80-year-old biologist Bruce Means teamed up with professional climbers and Indigenous people to trek through the jungle and get to the top of an uncharted tepui named Weiassipu in search of frogs and adventure. 

For more information on this episode, visit nationalgeographic.com/overheard.
 
Want More?
To learn more about the expedition to the top of Weiassipu, take a look at Mark Synnott’s feature story in the upcoming April issue of National Geographic magazine. 

And to see these stunning sky islands for yourself, check out the National Geographic special Explorer: The Last Tepui, streaming on Earth Day, April 22, exclusively on Disney+.