Edible bird’s nest is made by a species of cave-dwelling swiftlets. Weaved from their saliva and harvested in caves and man-made nesting houses, bird’s nests are then painstakingly cleaned ...

Echolocation is the process of using sound to sense what is around you. Humans have harnessed this ability through the use of technology like sonar which uses sound waves to locate underwater objects ...

Here, Indian art has found one of its most perfect expressions, particularly the huge high reliefs in the main cave. Description is available under license CC-BY-SA IGO 3.0 Het eiland Elephanta ...