Dave Bevan / Pair of Sand martins (Riparia riparia) feeding chicks, Carmarthenshire, Wales, UK, July.

Stephen Dalton / Earwig (Labidura riparia) on daisy flower. England, UK

David Kjaer / Sand martin (Riparia riparia) juvenile at entrance to nest burrow, Worcesrtershire, England, July

David Kjaer / Sand martin (Riparia riparia) adult and juveniles at entrance to nest burrows, Worcestershire, England, July

Stephen Dalton / Earwig {Labidura riparia} about to drop from yellow Iris flower, UK

Dave Bevan / Sand martin (Riparia riparia) flying to nest hole and feeding chick, Carmarthenshire, Wales, UK, June.

Dave Bevan / Slow motion clip of a Sand martin (Riparia riparia) feeding chick at entrance to nest hole, Carmarthenshire, Wales, UK, May.

Dave Bevan / Pair of Sand martins (Riparia riparia) at nest hole in bank of coal waste, with another trying to land at the same hole, Carmarthenshire, Wales, UK, April.

Dave Bevan / Pairs of Sand martins (Riparia riparia) at entrances to nest holes in bank of coal waste, Carmarthenshire, Wales, UK, April.

Dave Bevan / Flock of Sand martins (Riparia riparia) preening, perched on tree roots adjacent to nesting bank, Carmarthenshire, Wales, UK, April.

Dave Bevan / Slow motion clip of a Sand martin (Riparia riparia) digging nest hole in a bank of waste coal, Carmarthenshire, Wales, UK, April.

Dave Bevan / Slow motion clip of a pair of Sand martins (Riparia riparia) at nest hole, chasing away an intruder, Carmarthenshire, Wales, UK, April.