Cave swiftlets

Previous filming at Mulu had only been done in the front of the cave where natural light penetrates. It was a huge ordeal to get the camera crew across the cave's legendary mound of cockroach-ridden bat guano. The swiftlets build their nests at the back of the cave in total darkness, so to film them lights with dimmers were used that acclimatised the birds to artificial light gradually.

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Duration:

2 minutes

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