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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Tree Hole
by bruxi
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32nd place
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Found this odd hole in a big healthy Maple tree in the middle of the forest
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Submitted: Sunday, 13th April, 2014 14:48 (GMT)
Taken: Saturday, 13th October, 2012
Focal length: 300 mm
Shutter speed: 1/60 sec
Aperture: F22
ISO: 1600
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