Natural spectacle: Swallow colony occupies Sandberg
From building sand to nursery: Around 100 pairs of sand martins raise their offspring in a sand hill in Quakenbrรผck.
Vom Bausand zur Kinderstube: Rund 100 Uferschwalben-Paare ziehen ihren Nachwuchs in einem Sandhรผgel in Quakenbrรผck groร.