I've two crows living in the field next to my house. Every morning they crow three times each and then fly and crash into my bedroom window, clawining and beaking at the glass to get in. They do this on average 3 times and then go and sit back in the tree where they started. Appart from my windows being in quite a mess, I'd be quite interested to find out why they insist on doing this: it must be a little painful and appears to be a completet waste of time. It couldn't be that they fancy me could it?