Dave Bevan / Slow motion clip of a Sand martin (Riparia riparia) flying to nest hole and starting to dig before mate arrives to protect entrance, Carmarthenshire, Wales, UK, April.
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Ralf Kistowski/ BIA / Sand Martin (Riparia riparia), North Rhine-Westphalia, Germany
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Ralf Kistowski/ BIA / Sand Martin (Riparia riparia) at nest cavity, North Rhine-Westphalia, Germany
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Ralph Martin/ BIA / Sand Martin (Riparia riparia) chicks in nest cavity, Baden-Wurttemberg, Germany
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Hans Glader/ BIA / Sand Martin (Riparia riparia) at nest cavity, North Rhine-Westphalia, Germany
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Phil Savoie / Sand Martin (Riparia riparia) in flight catching insects over the Madison River, Montana, USA. May.
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Phil Savoie / Reflection of Sand Martin (Riparia riparia) hunting Speckled mayfly (Callibaetis sp.) Madison River, Montana, USA, May.
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Phil Savoie / Sand martin (Riparia riparia) perched on wire, Madison, Montana, USA, June.
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Phil Savoie / Sand martin (Riparia riparia) in flight, hunting insects above the Madison River, Montana, USA, June.
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Loic Poidevin / Sand martin (Riparia riparia) feeding chicks on nest, Brittany, France, June
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Loic Poidevin / Sand martin (Riparia riparia) feeding chicks on nest, Brittany, France, June
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John Waters / Sand martin (Riparia riparia) about to grab swan feather on surface of River Wye to line its nest located nearby, Herefordshire, UK, May.
