The partially dissolved nest of a swiftlet, a small bird native to Southeast Asia. Three times a year, swiftlets build nests out of their sticky saliva on cave walls and cliff sides, where they ...

Animals that are adapted to live in caves are known as troglofauna. Some - such as bats, bears and swiftlets - use caves on a temporary basis. Others reside there permanently, living out their entire ...

CAMPBELL, Calif., March 19, 2025 /PRNewswire/ -- High on the cliffs in Borneo, tiny birds known as swiftlets build nests that contain the highest natural concentration of sialic acid in the world.