.....well to me they are.
I am useless at identifying anything other than the really common, eg blackbird or obvious, eg cuckoo, birds by their song so I found this video for some of the more common warblers good -
I also found an app called BirdNet. It lets you record bird calls/song and then identifies them. The identification is done online so if you don't have access to Wifi you'll need to use data, but you can record the songs and upload them for identification later.
It does make mistakes but it is pretty good - it correctly identified blackbird, wren and goldfinch a few days ago. By mistake I recorded some conversation on the radio and it identified it as Homo sapiens, so perhaps it can identify other animal sounds too.
Dave