Wait! Before you kill anything, check out the feeders on Youtube. I have been dealing with house sparrows, house finches, doves, pigeons, and Java finches for two years and had given up until I saw the feeder on Friday on youtube, my husband made one on Sat, and my chickens are already going on
on the wooden step to reach into the trough and eating from it and on their way to learning how to open and close the feeder themselves when they want a nibble without feeding the entire wild bird population of O`ahu. It will take a couple of weeks, but chickens are pretty smart. Already the wild birds are looking very confused. I have a bird feeder, which the wild ones also enjoyed and I will continue that, as I like birds, but once the chickens learn the trick, I can go to work and know they will have food all day, as well as free ranging around the yard. The next step is to get the chickens used to the movement of the step that opens the top of the trough, but they show you how on youtube.
There is one from New Zealand made in tin, rather expensive, but you'll see another or wood. That's what my husband used. Watch the New Zealand one for training the chicken information.