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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54 entries
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Hollow Home
Helpful Hallow
Chinese lantern skeletal remains of fruit covering
Empty Suit
Sill Life
Cave
Hole in the Hollow
Skullz
Window Rock, Arizona
Puffin Burrow
Hollow Log
Snail Shell
One empty, two full
Just peanuts
Naturally Hollow - inside a painted tree bough
Inside out
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Sample entries
These entries were provided by the challenge host(s) as samples and cannot be voted on. Upload sample image.
Water-Worn Basalt
Rams Horn Shell, Hollow for Buoyancy in Deep Oceans.
Hollow Log
1,600px MAXIMUM
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