Our house is under attack by long-tailed tits, who for the last 2 days have been pecking at the windows, seemingly trying to get through them. But when we open the windows they don't come in.
It's something that the birds seem to be prone to, though no-one quite knows why. Attacking reflected rivals ? Draw the curtains and they stop, moving round to a different window.
Earlier they'd come round the windows and cleaned up all the spiders webs (and any associated eggs etc) in the corners of the wndows - apparently they use spider web in their nests.
Relentless LTT attack videos here, here, here and here with added cat. All the videos seem to be February/March, so it's obviously something to do with the time of year.
The cat one's really rather neat.