Circles in Nature

Challenge #46 in the Life in the Natural World series. Hosted by RuthC.
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In this challenge, show us circles formed by nature. This might be a flower, a mushroom, a leaf, or perhaps something formed by wind or water. Macro and close-up shots welcome. Subjects should be taken outside in their natural environment, not inside under studio lights. No balls or spheres, or spirals this time; they will have their own challenges later. No shots of the moon, (which is a sphere.) SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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by RuthC
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A trapdoor spider's circular hole, and its trapdoor.
Submitted: Sunday, 31st March, 2013 02:33 (GMT)
Taken: Sunday, 14th February, 2010
Focal length: 5.8 mm
Shutter speed: 1/640 sec
Aperture: F2.8
Notes: Hand-held, natural afternoon light.
Views: 389
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