David Tipling / Grey Squirrel (Sciurus carolinensis) climbing on fence, St James Park, London, UK, October
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Nick Upton / Black-headed gull (Chroicocephalus ridibundus) in winter plumage, perched on railings near boating lake, Regent's park, London, UK, February.
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Nick Upton / Wisteria flowering on railings, Royal Crescent, Bath, Somerset, UK, April.
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Nick Upton / Wisteria flowering on railings, Royal Crescent, Bath, Somerset, UK, April.
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Danny Green / 2020VISION / Red Fox (Vulpes vulpes) cub peering through railings in garden, Leicestershire, England, UK, July
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Laurent Geslin / Sparrow (Passer domesticus) male perched on railings, in urban park, Paris. France, November.
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Alan Williams / Male Bullfinch (Pyrrhula pyrrhula) perching on garden railings, Cheshire, UK, June
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Merryn Thomas / Radcliffe Camera with bikes chained to railings, Oxford, UK. June 2009.
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Tom Gilks / 'Bicycles prohibited' sign on railings as The Wave, climate change march ahead of the Copenhagen climate summit, passes by, London, UK, 5th December 2009
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Shattil & Rozinski / Western kingbird {Tyrannus verticalis} perched on railings, Colorado, USA
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GEORGETTE DOUWMA / Magpie (Pica pica) perched on iron railings in Regent's Park. London, UK.
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Warwick Sloss / Jay perched on railings {Garrulus garrulus} Bristol, UK
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Nick Turner / Royal crescent, Bath, Somerset, UK. 2003
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Nick Turner / Royal crescent, Bath, Somerset, UK. 2003
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Roberto Rinaldi / Bridge of Sighs, Venice, Italy.
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Merryn Thomas / Snow on Bristol's floating harbour, February 2009.