Go away!

I work in the basement of our building. We have a pigeon family right behind me, outside of course but through the window behind my desk. You'd think this'd be nice but it's not. If they're not trying to start a family they're being terrible at looking after one and there are constant fears for the little one, not to mention poor living conditions. Where's the light?! Then there's times like today where he tries to get in.
Optional theme of growth- I'm not sure if this can fit that....growth of my fear of pigeons, hoping there's no more growth and his monstrous image behind the glass stays normal....