Swifts pair for life and meet up at the same nest site in the UK each spring – usually in gaps under roof tiles and in the eaves of buildings. But as more and more old buildings are demolished or renovated, many swifts are returning to discover their nest site is gone.

Together with our partners Action for Swifts, Natural Apptitude, Swift Conservation and the Swifts Local Network we’ve developed Swift Mapper; a web-based mapping system and mobile app.

By telling us where you see nesting swifts you’ll help to build a picture of where swift nest sites need to be protected and where it would be best to provide new nest sites.

If you’re having trouble downloading the mobile app, try these tips from the App Store or Google Play. Make sure you also read our Swift Mapper FAQs.