Naturally Hollow

Challenge #94 in the Life in the Natural World series. Hosted by RuthC.
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In this challenge, show us examples in nature of subjects which are hollow. This might be a giant log which has become hollow through old age and decay, lava tubes, ice caves, or it may be something very small, such as marine tubeworm shells, bamboo, dried grass stalks. Macro and close-ups welcome. Where possible, the subject should be outside in the natural environment. SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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Fire Damage
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Inside a burned-out Redwood tree
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Submitted: Friday, 18th April, 2014 00:59 (GMT)
Taken: Sunday, 8th April, 2007
Focal length: 14 mm
Shutter speed: 1/30 sec
Aperture: F3.5
ISO: 400
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