DSC03608 - Birds Nest Collectors Climbing Pole in Cave - Wood Plugs
Photo © Tristan Savatier - All Rights Reserved - No authorized use without written permission
Wooden pole hanging from the roof of a natural cave (Borneo).
Those poles are used by birds-nest collectors to climb and harvest the birds-nests. The poles are formed of several segments, connected together by wood plugs.
The wood they use is the very strong ironwood or belian (Eusideroxylon Zawargeri).