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Male swiftlets use their own building material, gluey saliva, to make their nests. Constructed layer by layer along the cave walls, it can be weeks of painstaking work.
Aired:
11/01/11
Rating: NR
The full episode is no longer available for online streaming.
Why?
Please continue to enjoy extra(s) from this episode.
The full episode is still available for purchase through the "Buy Now" links.
