I think the crows are getting hungry,my OH built this brilliant cage to go round the feeders,only allows small birds in,put their food out yesterday and after,I happened to glance out and here were all the crows,surrounding the cage,they're fascinating to watch,you could see them trying to suss out how to get to that food,up on the roof of it,under it,looking up,getting their heads through the chicken wire but not reaching the food,they didn't get any though,so na na nana na
felt a bit sorry for them tbh