From 38:30, collecting for bird's nest soup (use link below):
www.bbc.co.uk/iplayer/episode/p02m63cs/earths-natural-wonders-living-on-the-edge-1-extreme-wonders


Mike

This video is seriously misleading. The opening shots are indeed Deer cave (i.e. Mulu, Sarawak) but all of the nest collecting is filmed at Simud Hitam, Gomantong (in Sabah), with a drone shot of the floor of Deer cave edited in at 42:55.
There is no nest collecting at Deer Cave.

DM.

Yup, I thought the same.