Cave of Swallows - Schwalbenhohle in Mexico
http://www.youtube.com/watch?v=ocpuuaNwMSw
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Cave of Swallows - Schwalbenhohle in Mexico,
Uploaded by febli69 on Sep 30, 2007,
YouTube.com,
A 2:06 minute video narrated by David Attenborough from the BBC.
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