Installed a new bird detector in the garden. Can confirm: There are birds.
Strong recommend for birdnet-go and the associated esp32 remote microphone. Way better than the old pi-based mess.
@jonty I meant to ask you this at the time you posted this - are you then feeding your electronic bird-spotting results to something like Merlin https://merlin.allaboutbirds.org ? I have the Cornell Lab app on my portable telephone and turn it on when I remember. But I forget.