Do wind turbines harm birds and wildlife?

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1. 1

   Estimates of aerial vertebrate mortality at wind farms in a bird migration corridor and bat diversity hotspot

   Global Ecology and Conservation (Cabrera‐Cruz et al.)Published Feb 12, 2020Checked Oct 3, 2026

   “Although we found more bird than bat carcasses, our corrected estimates are higher for bats than for birds. Corrected mortality ranges between 4.0 – 5.6 birds/MW and 9.08 – 21.23 bats/MW during the months of the study, or between 9.06 – 12.85 birds/MW/year and 20.47 – 43.79 bats/MW/year. Contrary to patterns of aerial vertebrate mortality at wind farms in temperate latitudes, all bat and most bird fatalities were from resident species, even when considering bird migration months only. Corrected bird mortality was highest at the wind farm with the tallest wind turbines. Our estimated fatalities/MW/year are higher than rates of bat and bird mortality recorded at numerous wind farms in the United States, and our estimates may still be biased low. Thus, our results offer a first glimpse to the magnitude of bird and bat mortality at this tropical hotspot for aerial vertebrates. More than 15 wind farms are currently operating in the region, hence a larger-scale effort is needed to fully understand the cumulative mortality of aerial vertebrates, particularly of resident species, at this wind energy hub and diversity hotspot.”

2. 2

   Bird and bat species' global vulnerability to collision mortality at wind farms revealed through a trait-based assessment

   Proceedings of the Royal Society B Biological Sciences (Thaxter et al.)Published Sep 13, 2017Checked Oct 3, 2026

   “We related collision rate to species-level traits and turbine characteristics to quantify the potential vulnerability of 9538 bird and 888 bat species globally. Avian collision rate was affected by migratory strategy, dispersal distance and habitat associations, and bat collision rates were influenced by dispersal distance. For birds and bats, larger turbine capacity (megawatts) increased collision rates; however, deploying a smaller number of large turbines with greater energy output reduced total collision risk per unit energy output, although bat mortality increased again with the largest turbines. Areas with high concentrations of vulnerable species were also identified, including migration corridors. Our results can therefore guide wind farm design and location to reduce the risk of large-scale animal mortality. This is the first quantitative global assessment of the relative collision vulnerability of species groups with wind turbines, providing valuable guidance for minimizing potentially serious negative impacts on biodiversity.”

3. 3

   Responses of birds and mammals to long-established wind farms in India.

   Scientific reports (Kumara et al.)Published Jan 25, 2022Checked Oct 4, 2026

   “xt, we assessed the responses of birds and mammals to the wind turbines in central Karnataka, India from January 2016 to May 2018 using carcass searches to quantify animal collisions (i.e., birds and bats), fixed radius point count for bird population parameters, and an occupancy framework for assessing the factor that determines the spatial occurrence of terrestrial mammals. The mean annual animal fatality rate per wind turbine was 0.26/year. Species richness, abundance, and unique species of birds were relatively higher in control sites over wind turbine sites. Species and functional compositions of birds in control sites were different from wind turbine sites, explaining the varied patterns of bird assemblages of different feeding guilds. Blackbuck, Chinkara, Golden Jackal, and Jungle Cat were less likely to occupy sites with a high number of wind turbines. The study indicates that certain bird and mammal species avoided wind turbine-dominated sites, affecting their distribution pattern. This is of concern to the management of the forested areas with wind turbines. We raised conservation issues and mitigating measures to overcome the negative effects of wind turbines on animals.”

4. 4

   Efficacy of Painting Wind Turbine Blades as a Mitigation Measure to Reduce Bird Collisions in a Mediterranean Wind Farm.

   Ecology and evolution (May et al.)Published Sep 14, 2026Checked Oct 4, 2026

   “In recent years, studies have been carried out to test the efficacy of painting wind turbine blades to increase their visibility and forewarn birds, thus preventing collisions. To corroborate these studies in other site- and species-specific settings, we report on a long-term experiment (2012-2024) performed at the El Ruedo wind farm in Cadiz, Spain. One of three rotor blades was painted black at four of the 20 wind turbines, underneath which daily fatality searches were performed both before (9.5 years) and after (3.5 years) treatment. This Before-After-Control-Impact experiment resulted in a significant reduction in bird fatality rates of 74% at the painted turbines relative to unpainted control turbines. The treatment had the largest effect in reducing passerine fatalities as well as large waterbirds, but less so for birds of prey. To which extent local abundance, flight activity or visual fields affect the measure's efficacy remains as yet unclear. As this mitigation measure has now been shown to be functional at sites spanning a wide latitudinal range, it is paramount to overcome implementation hurdles and evaluate other site- and species-specific conditions.”

5. 5

   Bird collisions with wind generators in China: a review of avoidance and minimization measures.

   Environmental monitoring and assessment (Friedrich)Published Apr 13, 2026Checked Oct 4, 2026

   “This review focuses on methods for avoidance and minimization of bird collisions, with a particular emphasis on their applicability in China-the world's largest wind energy producer. International measures to mitigate bird collision are synthesized, e.g., siting strategies, detection-reaction systems (DRSs), turbine painting, ultraviolet (UV) lighting, manual curtailment, Bluetooth-based detection, acoustic deterrents, and habitat management. Each method is evaluated in terms of technical feasibility, ecological effectiveness, and implementation challenges. While siting remains the best preventive measure, dynamic technologies such as AI-enhanced DRSs and integrated habitat management show promising potential. However, data scarcity, regulatory gaps, and limited empirical testing continue to hinder widespread adoption in China. The paper concludes by recommending multi-layered strategies that combine pre-construction planning, real-time monitoring, and post-construction habitat adaptation, alongside the need for improved national monitoring systems and context-specific field trials.”

6. 6

   Human-Caused High Direct Mortality in Birds: Unsustainable Trends and Ameliorative Actions.

   Animals : an open access journal from MDPI (Kaplan)Published Dec 31, 2024Checked Oct 3, 2026

   “We know of the crucial impact of habitat loss on the survival of birds and its effects on biodiversity. Direct mortality via anthropogenic causes is an additive but biologically important cause of avian decline. This is the focus of this paper. This paper synthesises and interprets the data on direct anthropogenic causes of mortality in birds, and it also discusses emerging and relatively hidden problems, including new challenges that birds may not be able to manage. This paper points out that such deaths occur indiscriminately and have negative behavioural and reproductive consequences even for survivors. All of these factors are important to address, because any functional habitat depends on birds. This paper suggests that some of this death toll can be reduced substantially and immediately, even some of the seemingly intractable problems. This paper also proposes cross-disciplinary solutions, bearing in mind that "ecosystem services" provided by birds benefit us all, and that the continued existence of avian diversity is one cornerstone for human survival.”

7. 7

   Avian Collisions with Wind Turbines: A Summary of Existing Studies and Comparisons to Other Sources of Avian Collision Mortality in the United States

   Research paper (Erickson et al.)Published Aug 1, 2001Checked Oct 3, 2026

   “The purpose of this paper is to provide a detailed summary of the mortality data collected at windplants and put avian collision mortality associated with windpower development into perspective with other significant sources of avian collision mortality across the United States. We provide a summary of data collected at many of the U.S. windplants and provide annual bird fatality estimates and projections for all wind turbines in the U.S. For comparison, we also review studies of avian collision mortality from other major human-made structures and report annual bird fatality estimates for these sources. Other sources also significantly contribute to overall avian mortality. For example, the National Audubon Society estimates avian mortality due to house cats at 100 million birds per year. Pesticide use, oil spills, disease, etc., are other significant sources of unintended avian mortality. Due to funding constraints, the scope of this paper is limited to examining only avian mortality resulting from collisions with human-made obstacles.”

8. 8

   Canadian Estimate of Bird Mortality Due to Collisions and Direct Habitat Loss Associated with Wind Turbine Developments

   Avian Conservation and Ecology (Zimmerling et al.)Published Jan 1, 2013Checked Oct 3, 2026

   “Zimmerling, J. R., A. C. Pomeroy, M. V. d'Entremont, and C. M. Francis. 2013. Canadian estimate of bird mortality due to collisions and direct habitat loss associated with wind turbine developments. Avian Conservation and Ecology 8(2): 10.http://dx.doi.org/10.5751/ACE-00609-080210”

9. 9

   Numbers of wildlife fatalities at renewable energy facilities in a targeted development region.

   PloS one (Conkling et al.)Published Dec 15, 2023Checked Oct 4, 2026

   “We also aimed to provide a perspective on approaches interpreting these types of data, given inherent limitations in how they were collected. Mourning doves (Zenaida macroura), Chukar (Alectoris chukar) and California Quail (Callipepla californica), and passerines (Passeriformes), accounted for the most commonly reported fatalities. However, our aggregated count data were derived from raw, uncorrected totals, and thus reflect an absolute minimum number of fatalities for the monitored period. Additionally, patterns in the raw data suggested that many species commonly documented as fatalities (e.g., waterbirds and other nocturnal migrants, bats) are rarely counted during typical pre-construction use surveys. This may explain the more commonly observed mismatch between pre-construction risk assessment and actual fatalities. Our work may serve to guide design of future scientific research to address temporal and spatial patterns in fatalities and to apply rigorous guild-specific survey methodologies to estimate populations at risk from renewable energy development.”