I spent 20 years and more money than I want to admit to spending on trying to get quail numbers back to my boyhood levels. Three times we had number of coveys that were near our target goals only to see them crash in a two year period. One crash was weather related due to long zero degree weather followed by very cold and wet springs. No hatch for two years crashed our gains. Second crash might have been due to preditor pressure. Last crash came in what seemed ideal conditions. They died anyways. I figured I had quail with low self esteem, a lack of desire to reproduce or were unable to read the literature which explained they should be in quail heaven. Instead they went to heaven.