Alan Williams / Sand Martin (Riparia riparia) landing on cliff to make nest hole, Wirral Merseyside UK June
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Alan Williams / Sand Martin (Riparia riparia) digging at cliff with it's beak to make nest hole, Wirral Merseyside UK June
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Alan Williams / Sand Martin (Riparia riparia) flying along cliff at nest site, Wirral Merseyside UK June
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Alan Williams / Sand Martin (Riparia riparia) singing while flying over cliff nest site, Wirral Merseyside UK June
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Alan Williams / Sand Martin (Riparia riparia) digging at cliff with it's beak to make nest hole, Wirral Merseyside UK June
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Alan Williams / Sand Martin (Riparia riparia) singing perched on cliff at new nest hole, Wirral Merseyside UK June
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Markus Varesvuo / Sand martin (Riparia riparia) in flight, Israel, May
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Markus Varesvuo / Sand martin (Riparia riparia) in flight, Israel, May
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Markus Varesvuo / Sand martins (Riparia riparia), Barn swallows (Hirundo rustica) and Yellow wagtails (Motacilla flava) collecting mud for nests on ground, Israel, May
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Markus Varesvuo / Sand martin (Riparia riparia) nesting colony, Hungary, June
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Markus Varesvuo / Sand martin (Riparia riparia) on wall, Hungary, June
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Markus Varesvuo / Sand martin (Riparia riparia) chick at nest, calling, Hungary, June
