An app that claims to be able to recognise the calls and songs of birds has been released, saying that for £3.99 it can differentiate between the sounds made by 220 British birds. That must be all of them.
The app is out on iOS, with the description saying: "The way in which it works is simple – make a recording with your iPhone, and Warblr will identify the species of bird/s that can be found in that recording, providing you with images and descriptions to help you learn more about our feathered friends."
Don't bother searching/waiting for an Android version of it, mind, as that question's already been asked/answered on Twitter, where the maker said: "...we are hoping to develop for Android ASAP using any funds we make from the iPhone app." [iTunes via Telegraph]