I've had Merlin app for the last few weeks, it's fascinating. Sometimes there are obvious things that go undetected like rooks and crows. Other times, there's a single tweet (or squawk) and an instant identification of a redstart, tern or woodpecker. I'd no idea there were so many blackcaps about.Not been on the thread before but really need to let you know about an App. that has my daughter giddy with excitement (apologies if it has been covered previously).
It's called Merlin and automatically picks up and identifies bird calls in the background. She may not have seen many of the actual birds but never ceases to be amazed by the species all around her.