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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Dude!
by spqr_ca
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At a bird bath in front of Metro Hall in Toronto. The little ones were pretty funny to watch, though the pigeons may have a different opinion.
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Submitted: Monday, 25th January, 2010 03:54 (GMT)
Taken: Tuesday, 10th November, 2009
Focal length: 150 mm
Shutter speed: 1/180 sec
Aperture: F4.5
ISO: 400
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Views: 273
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