Ouch! Thorns, Spines & Prickles

Challenge #12 in the Life in the Natural World series. Hosted by RuthC.
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Many plants grow sharp prickles, spines or thorns, usually to protect themselves from predators, such as insects, birds, or animals. Show us the interesting or bizarre forms of these sharp appendages in your entries, which should be in their natural environment, not under studio lights. Macro shots are welcome. Insects or other small creatures may be present, but must not dominate the picture. Check Wikipedia for more information about this thorny subject. SIZE DOES MATTER: See below!
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Horse Chestnut
by vgabor
Click here for full size original image
12th place
Natural sunlight in the morning. Chestnut photographed on the tree: one can see hidden details in the blacks by screwing up the gamma extremely.
Submitted: Tuesday, 18th September, 2012 21:02 (GMT)
Taken: Tuesday, 18th September, 2012
Focal length: 140 mm
Shutter speed: 1/320 sec
Aperture: F5.8
ISO: 200
Notes: PP: slightly cropped; blue channel is decreased a bit in irfanview.
Views: 528
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