What happened to my window screen?

sonipez2003 asked:


I live in a basement apartment. Today was a really nice day so I decided to open the windows and let some fresh air in. I raised the blinds and opened the window to see there were two big rips in my screen. And there were a whole bunch of pebbles inside the window. It was very wierd. Any ideas what kind of animal would have caused this?

Lyric