Chewy Chairs

Ahh...birds.

I love my little visitors but am currently really ticked off at the house finches. Why, oh, why, have they found the need to ruin two of my patio chairs by picking them to death? The photo on the bottom shows the amazingly accurate rectangle picked out on the top of one chair cushion.  The other two show the doubly chewed top and the seat.  

Two  peculiar things are that the other two chairs haven't been touched and that the only areas plucked to death have been on the white stripes.

Both chairs are close to my sliding glass door so I'm considering balling up some socks and tossing them at the door as soon as one of the little devils land. Problem is that despite once having a rocket for an arm as a softball catcher, I now throw like a girl (sorry girls).