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 It is often seen swooping across inland water for insects.
Sand Martin
Sand Martins
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).