What distinguishes many, but not all, swiftlet species from other swifts and indeed almost all other birds( the Oilbird being an exception) is their ability to use a simple but effective form of echolocation to navigate in through the darkness of the caves where they roost at night and breed.
Himalayan Vulture | Himalayan Snowcock | Himalayan marmot | Himalayan salt | Edible-nest Swiftlet | Himalayan Mountaineering Institute | Darjeeling Himalayan Railway | Black-nest Swiftlet | Bhutan: A Visual Odyssey Across the Last Himalayan Kingdom |