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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nature's syringe?
Prickly Threesome
Thorny Agave Plant
vicious spines of gorse
Prickly Pear cactus near Sedona, AZ
Thistle in front of Appollo Sanctuary (Delos, Cyclades, Greece)
Don't tread on me!
Sharp
Please don't sit on me!
Barrel Cactus Bald Spot
Ouch!
A Blooming Pincushion
Rifle Gap Cactus Flower
White Crown of Thorns
Mother in low chair
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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.
Prickles All Over
Thorns in Winter
Aloe With Attitude
1,600px. MAXIMUM
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