The next day we bused to Niah National Park where we stayed in a lovely park hostel and met some lovely people from Canada and Holland who are 'grey nomads' like us!
There is a well constructed boardwalk into the park and at the end of the walk is a cave with a 250 metre wide entrance - one of the world's largest. The house at the entrance is used by the local Penan people as they sweep up the bat and swift excrement to sell for fertiliser.
Throughout the cave are long bamboo poles which the Penans climb with their oil lamps to look for swiflets' nests. The birds' saliva that binds the nests is used in the Chinese birdnest soup. We read that they can get $1,000US a kilo for good quality nests. 
At the far end of the cave is a burial cave where some old funerial boats remain and some cave paintings. 
The skull of a 40, 000 year old person was found in this cave and there are still archaeological digs going on presently inside the caves.
