A Crystal Chalice

Clip: Season 30 Episode 2 | 1m 17s

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

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Major support for NATURE is provided by the Arnhold Foundation, The Fairweather Foundation, Kate W. Cassidy Foundation, Sue and Edgar Wachenheim III, Kathy Chiao and Ken Hao, Charles Rosenblum, Filomen …


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