Doug Gimesy / Silver gull (Chroicocephalus novaehollandiae) juvenile, standing on sea wall, Port Philip Bay, Sandringham, Victoria, Australia.
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Terry Whittaker / Sand martins (Riparia riparia) flying to and from their nests in old drainage pipes along River Mersey retaining walls. Greater Manchester, UK.
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Matthew Maran / Sea Wall at sunset New Forest National Park, Hampshire, England, UK. August 2018.
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Terry Whittaker / Sand martins (Riparia riparia) returning to chicks in nest located in old drainage pipes along River Mersey retaining walls, Greater Manchester, UK.
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Terry Whittaker / Pair of Sand martins (Riparia riparia) returning to chicks at nest located in old drainage pipes along River Mersey retaining walls, Greater Manchester, UK.
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Nigel Cattlin / Irrigation canals and newly repaired mud irrigation levies channeling water to paddy rice crops in ear, Luzon, Philippines