Starlings do come in thousands, Google 'Murmuration', it's the word for a huge flock of starlings and there are some good videos. It looks as though there is meaning in the flock's movement but someone studied them with a drone and each bird is only checking out the movement of a few others around it. Starlings look black at a distance, but up close they have amazing colours, especially in sunlight, it's like oil on water.
We get jackdaws round here, every village has a flock it seems. They are great, they used to gather in the trees at the end of our last garden and they would take off and fly in a big circle, swooping and diving just for the fun of it. They have a sort of grey hood that makes them easily distinguished.
I see the occasional rook in the garden, but usually the jackdaws will gang up to see him off. Rooks are the ones you see following ploughs, a sharper, pointier bill than the jackdaw, and all black.
Lovely pictures of the magpie, they are very family oriented, a young one got hit by a car opposite our old house and the parents and siblings spent two days coming back to walk around the body.