Wasn't sure if this is advanced or not, but here goes... I would like some help to identify some birds I've seen out and about in Brum, and I am convinced they are not native birds. I wondered if anyone else had come across them? You'll have to forgive my ignorance if this is a really obvious one, I'm very new to all this!
I first noticed these little guys last christmas, gathered in a HUGE flock in a tree in the middle of Birmingham city centre one evening shortly after dusk.
They not only look different to any birds I've seen, but they behave and sound different. They are very acrobatic and fast, and they have a high pitched twittering a little like a budgie or similar. Also they flock in much bigger groups than tits, wagtails, sparrows or similar.
Since then I've seen them in several other places - parks etc, and this evening a big gang of them were on the feeder in our garden, again at dusk, in the pouring rain.
They are about the size of a sparrow, with a long tail with about three distinctive verticle black and white stripe. Colour is hard to tell really, a bit like a coal tit/ great tit? Grey, black, white, maybe a little yellow or green? Sorry, don't have a photo as it was too grey and rainy to come out well. The most distictive thing is the noise and the way they move and flock together.
Any ideas anyone? I am really intrigued by these little guys, would love to find out more.