Sound the alarm

This is what wakes me every morning:

And this is what it sounds like:

Only longer and louder and more of them. The first morning when I woke up, I thought that it was an alarm going off to wake up all of the boarders. These birds are everywhere. They kind of remind me of squirrels on the Mall in Washington DC, creepily acclimatized to people. Think Children of the Corn with wings and you're on the right track.