This is a video about a sand martin colony in Sweden.

From BirdLife:

From the sands of the Sahara to the sands of CEMEXquarries

Wed, Apr 10, 2013

Sand Martins make an amazing journey every winter from the Sahara to the UK to breed in piles of sand. This year, every CEMEX UK quarry will be creating the sheer banks of sand that Sand Martins love to make their homes in. Sand Martins live in colonies, sometimes with over 100 pairs breeding on a single site.

In addition to the creation of sand banks, CEMEX in partnership with the RSPB (BirdLife in the UK), is launching a Sand Martin awareness campaign with an advice sheet to help quarry site managers accommodate this protected species. CEMEX and the RSPB have put together a management plan to ensure that all 60 quarries have suitable nesting sites available for this year’s…