So this is weird because my family have never had this problem before, but for the last few weeks, a male cardinal (or possibly multiple cardinals) has been repeatedly headbutting the windows of our house. Apparently our neighbors are having the same issue, even though I never remember this happening until now (did cardinals just mutate or something?), and one of our neighbors had their window broken by one of these little red monsters.

Anyone else ever experienced this? It's really annoying hearing the damn little bird slamming his head against the window again and again for hours on end.