Salivating for a New Nest, Wild Borneo

Cave swiftlets use saliva to build their nests high on cave walls. Subscribe: Watch all clips from Destination Wild here: About National Geographic Wild: National Geographic Wild is a place for all things animals and for animallovers alike. Take a journey through the animal kingdom with us and discover things you never knew before, or rediscover your favorite animals Get More National Geographic Wild: Official Site: Facebook: Twitter: Instagram: