Wow, I couldn't agree with Brutal more. There are simply to many variables to accurately predict wildlife trends. Factor in the "Butterfly Effect" principles and it becomes nearly impossible. That is not to say there cannot be some short term success. The RMEF has used GIS discipline to track core wintering area for elk, then over lapped poplutaion desity and growth maps to identify critical habitat areas, however, actually predicting wildlife populations via precipitation etc is difficult. An obscure disease can throw poplutaions into a downfall, or a change in predation etc. Additionally, population trends tied into precipitation would have to be adjusted yearly would they not?