This document summarizes a study conducted by Pandion Systems, Inc. and contributors for NYSERDA on the relative risks to wildlife from different electricity generation sources. It finds that risks vary by life cycle stage and across sources. Coal generally poses the highest risks, while wind and nuclear pose lower risks. However, a holistic, cradle-to-grave approach is needed, as all sources affect wildlife. Further analysis is still required to quantify impacts. The framework aims to facilitate rational discussion of comparative wildlife impacts across different electricity generation types and life cycles.