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Roads have direct and indirect ecological impacts on wildlife, and vehicle collisions are one of the top impacts with regard to birds. Current available mortality estimates for birds are derived from one study, which prompted a literature review of 20 mortality rates extracted from 13 studies, which generated 4 separate estimates along with uncertainty from the different datasets.
Reintroducing the American Bison to various locations throughout the west is becoming a reality. Research and observation in specific regions has been continuous since 2005 and explores the ecological impact and expected changes for the existing wildlife with the presence of these large herbivores. As a result of these studies, we'll see herds of bison returning to Great Sand Dune National Park and Preserve and other areas where the environment has been found suitable for supporting herd management.