Predation, Again

In recent weeks I've observed the unfortunate signs of predation: loose piles of feathers.  It's the unmistakeable signs of a hawk, and probably a Cooper's which has made off with songbirds here before.  Based on the feathers I suspect either titmice or juncos are the prime victims.  This certainly goes on, and it's not pleasant to see, and the species populations recover.  I hope there really is enough cover and that these feeders aren't an unnecessary risk for the guests.  We can overlook hawks but I sure don't want to make it too easy for them!