Yesterday there was an all out war going on in one of my martin houses. A starling was trying to invade and I'm not sure if the starling was pulling out a martin nest or vice versa.. but all the squaking and dive bombing was making quite the commotion. I think the martins won. Nesting materiel was flying through the air and the barn swallows and bluebirds were swooping in and gathering it for themselves and taking off with it 
