26/ Sand Martin (Riparia riparia)

originally nested in clay walls of meandering rivers, but after extensive regulation of river channels, they have almost disappeared from the landscape. Nowadays, it mostly digs its nesting burrows in sandstone walls created by mining. During the nesting season, it is necessary to move the mining elsewhere, but after nesting it is possible (or even desirable) to remove the wall with the burrows - the next year the shorebirds will dig their burrows again. The problem of nesting sites in quarried sandpits is to ensure regular renewal of the walls, as they quickly break down and become overgrown with vegetation, making them unsuitable for nesting.