White Wagtail

The White Wagtail is also a sign of spring!
White Wagtails breeding season is from about April to August. Both male and female are responsible for building the nest, with the male responsible for initiating the nest building and the female for finishing the process.
For second broods the female alone builds the nest as the male is still provisioning the young. It is lined with soft materials, including animal hair. The nest is set into a crevice or hole; traditionally in a bank next to a river or ditch, in walls, bridges and buildings or roofing tiles.
They are using the same nest through their whole life.
Around 3-8 eggs are laid, with the usual number being 4-6. Its eggs are cream-coloured, often with a faint bluish-green or turquoise tint, and heavily spotted with reddish brown; they measure, on average, 21 x 15 mm (0.83 x 0.59 inches).
The eggs begin to hatch after 12 days (sometimes as late as 16 days). Both parents feed the chicks until they fledge at around 14 days, and the chicks are fed for another week after fledging.
This information comes from Wikipedia.