I currently have 37 coturnix quail in a 10x16 run, but will be culling in a few weeks down to about 15. My husband wants to add in some flying birds to make it a flight pen, but we are wondering what birds would be compatible/ hardy with quail in central Illinois. We have heard that zebra finches and budgediers (sp?) can tolerate the climate (given the right shelter). Anyone with experience or knowledge of other hardy birds? And will they leave my Quail alone?