Ugliness in Nature

Challenge #198 in the Life in the Natural World series. Hosted by RuthC.
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Yes, I know that this is a human, subjective view of the world, that we see aspects of nature as beautiful or ugly, and not as the animals, birds, insects, plants see themselves. Given that proviso, show us what you consider really, really ugly in nature. Man-made ugliness will be disqualified, and no people, or domestic pets. Macro and close-ups welcome. Size of entry: 1,600 pixels on the longer side. And no, DPR does NOT reduce the sizes of the entries for you. You need to do this yourself or be disqualified!
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On Dry Rock
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This was a kind of sea snail that left in dry rock after sea descend.
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Submitted: Monday, 25th April, 2016 14:04 (GMT)
Taken: Monday, 1st June, 2015
Focal length: 20.8 mm
Shutter speed: 1/500 sec
Aperture: F3.6
ISO: 100
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Views: 177
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