It’s basically a (personal) challenge to see how many species you can see, or hear, from your lockdown location.
Download the BirdLasser app, go the the play section, scroll down and join the lockdown challenge. The birds you identify during the lockdown period will be tallied and you can see where you stand against others if you like (although the guys on reserves and farms are killing it in comparison).
Good fun - I’m on 81 after thinking 40ish would be my limit. Amazing what is out there with a bit of time and patience.