Swallows compare and contrast suitable nesting sites.
Here, a safe place for their eggs is provided under the roof of a large vegetable market.
And their voices were high-pitched and echoing in the sky.
I finally managed to track down the last couple of street art mosaics in Wilma van der Meyden's Glasgow Street Swallow series. This beautiful one on James Watt Street is made from the type of unglazed porcelain tiles often uses to make threshold mosaics on older Glasgow buildings.
Another of the beautiful Street Swallows from Wilma van der Meyden. This one is just off Oswald Street in the centre of Glasgow and is made from seaglass collected from the shores of the Firth of Clyde.