From Cornell Lab of Ornithology:

Merlin Bird ID just got even better with a new & improved Sound ID model! PLUS we’ve added support for 250 species in Europe, like this Dartford Warbler! Available for Android and iOS devices for free, Merlin helps you ID birds using photos, sounds, or by answering 5 simple questions: https://hubs.la/Q017HHXT0 (If you already have Merlin on your phone, just update the app to get the new features.)