Ive just downloaded an ap called Birdsnet It analyses bird song and tells you want it can hear
I have a small garden and surrounded by very mature trees, so there is constant chatter of bird
Its picked up the robin,woodpecker ,crows wood pigeons, collared doves, blue tits, great tits ,magpies , etc that i can see
But it constantly picks up a chiffchaff which i have never seen in the garden, suspect they are high in the tree and wrens which i havent seen in a while..
Just found a longtailed tit who come and go from the garden.
Its a bit strange though it doesnt recognise the cockerals that 2 of my neighbours have.