Sand Martin

Riparia riparia

Sand Martin Sand Martin in flight Sand Martin
The Sand Martin (Bank Swallow in North America) breeds across the northern hemisphere (northern Eurasia/America) and winters in the southern hemisphere
Sand Martin Sand Martin Sand Martins
It is often seen swooping across inland water for insects
Sand Martin nestholes Sand bank Sand Martins nesting
Sand Martins (Bank Swallows), as their name indicates, nest communally in holes in sand banks (the one above was artificially built for them)
 

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House martin
House Martin		 Crag Martin
Crag Martin