I've spent a lot of time sitting in the garden (and gardening there) over the last few weeks, during the fine weather, and listened as never before to the bird song. Watching the birds, and trying to ID which ones they are. Some like the blackbird, sparrow, thrush, wood pigeon and robin are obvious, but there's others I don't know.
I've noted that there are nests in some of the bushes, especially in the rockery which is just outside the conservatory window. Fascinating seeing the birds fly in and out. I reckon with one tall bush, there are sparrow occupying the lower half, and blackbirds occupying the upper half. Made a lot of sense as the bush is very thick, so must be comparatively warm and dry inside. Even seen them fly in with straw in their beaks.
Interesting when I sit out there they just continue with their normal chirping. But as soon as the cat comes out, they start their alarm calls - even though she's not actually that interested in them. On one occasion a group of them "mobbed" her, and she ran back indoors.
The almost complete absence of planes means you can listen to them uninterrupted. Especially as all the neighbours seem unusually quiet as well.