There's a pair of House Wrens that live in a little birdhouse on my garage, just a few feet away from my house. They take turns singing in the morning, and chittering at me if they think I'm too close to the nest. Tonight I've managed to infuriate them by letting Maeve sit in the kitchen window, which is about 15 feet from the birdhouse. One of those little wrens has been chirping its little head off at her for a solid half-hour now, apparently not realizing that the cat can't get past the screen.
That is one angry little bird.