Nature » swiftlets http://www.pbs.org/wnet/nature The premiere natural history program on television. Fri, 17 May 2013 19:53:38 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 The Animal House: Video: A Crystal Chalice http://www.pbs.org/wnet/nature/episodes/the-animal-house/video-a-crystal-chalice/7198/ http://www.pbs.org/wnet/nature/episodes/the-animal-house/video-a-crystal-chalice/7198/#comments Fri, 28 Oct 2011 12:16:30 +0000 fultonk http://www.pbs.org/wnet/nature/?p=7198 View full post to see video)
Male swiftlets use their own building material, gluey saliva, to build their nests. Constructed layer by layer along the cave walls, it can be weeks of painstaking work. (Video limited to U.S. & Territories.)
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