The odd one out

Challenge #1 in the Visual versus Frontal Cortex series. Hosted by Xscream.
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Find something repetitive, with one exception. For example a lot of apples with one pear, orange flowers with just one yellow one in between, or some young people with one old person in their middle.
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Odd Man Out
by InPort
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This trio of Phalacrocorax sulcirostris (Little Black Cormorants), were drying out and preening in the afternoon sun on the bowsprit of the Alma Doepel, an historic sailing ship, that used to be moored at Lady Nelson Wharf in Port Macquarie, NSW, Australia on a late spring day.
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Submitted: Friday, 22nd January, 2010 08:06 (GMT)
Taken: Friday, 22nd January, 2010
Focal length: 67 mm
Shutter speed: 1/500 sec
Aperture: F7.1
ISO: 80
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Views: 265
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