Abstract
Scientific research on the effects of wind farms on wildlife has shown that these human-made structures can seriously threaten many sensitive bird and bat species, many of which are of conservation concern. Thus, models predicting collision risk with moving blades could represent a powerful tool for landscape planning. However, those predictive models, developed using available (i.e., past) information on mortality, are challenged by the fact that they should be helpful in anticipating mortality in different regions, even where factors contributing to that risk are distinct or change in magnitude.