Nature  A Crystal Chalice

Male swiftlets use their own building material, gluey saliva, to make their nests. Details

 

Program: Nature

Episode: A Crystal Chalice

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.

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Duration: (1:17)
Premiere Date: 11/02/2011
Episode Expires: Never
TV Rating: NR


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