Primary Research Sources — Eagle Exchange Hub Research

Meant For You

The same research, written for your role. Choose your perspective — every tab ends with a concrete takeaway you can act on.

🐑 For Western Producers

This page is your ammunition — in the good sense. Every claim made anywhere on this site traces back to a named, published study or a federal record. When you sit across from an agency official, a state legislator, or a skeptical neighbor, the difference between 'I heard' and 'the 2022 study in Ecological Applications found' is the difference between being dismissed and being taken seriously.

✅ Do this Before any meeting where you're making the rancher case, pull the two or three citations relevant to your point from this page. Sourced beats sincere, every time.

🧤 For the Falconry Community

Advocacy is won on citations, not assertions. This is the complete reference list for every figure used to argue the falconry-reform case — bring it to permit hearings, public-comment periods, and agency meetings. When you claim the 6-bird cap lacks a biological basis, the person across the table will ask 'according to whom?' This page is the answer.

🎯 The leverage point Walk into every hearing with the citation list. An argument with DOIs attached is hard to wave away.

🔬 For Researchers

This is the master bibliography for the entire hub — Millsap (2022), Bedrosian (2018), Katzner (2022), Mojica (2018), Steenhof (1997), Hagen (2024), Gedir (2025), and the supporting federal datasets — with DOIs and direct links throughout. It is assembled so any figure cited anywhere on the site can be traced to its primary source and independently verified. That traceability is the point: nothing here asks for trust it hasn't earned.

📄 Key source Full peer-reviewed bibliography with DOIs — Ecological Applications, Science, PLOS ONE, J. Wildlife Management, The Condor, Wildlife Biology, Biological Conservation.

🏛️ For Agencies & Policymakers

This page provides full, auditable primary-source documentation for every figure cited across the Research Hub — formatted so it can be incorporated directly into official review records, NEPA documents, or rulemaking dockets. The intent is institutional: an agency reviewer should be able to verify any claim on this site without a single phone call.

⚖️ The policy lever Every figure here is citation-ready for the administrative record — usable directly in review and rulemaking documentation.

👥 For the General Public

Wondering whether to trust the numbers on this site? Here's the honest answer: every single figure links back to a published scientific study or an official government record. Nothing is invented, and nothing is hidden. You can click through and read the original sources yourself.

💡 In one line Every fact on this site is sourced and checkable — no spin, no mystery.

📚 Primary Research Sources

📐 About These Sources

Sources are classified by evidence type using the key below. Peer-reviewed articles in scientific journals receive the highest confidence weighting. Government data are from federal/state agencies and are generally high quality but may reflect different methodologies across time periods. Field/agency surveys are direct observational data but are typically constrained to specific geographies or time windows. Model estimates incorporate uncertainty; always consult original publications for confidence intervals.

● Peer-Reviewed ● Gov't / Federal ● Field / Agency Survey ~ Model Estimate ◈ Org. / NGO Report

Eagle Migration & Biology

Migration corridors of adult Golden Eagles originating in northwestern North America — Domenech et al. (2018) · Intermountain Journal of Sciences Peer-Reviewed

Golden Eagle Range Map — Cornell Lab of Ornithology Org. Report

Golden Eagle Status Fact Sheet — U.S. Fish & Wildlife Service Gov't Data

Movements and Migration — Golden Eagle — Birds of the World (Cornell/BOW) Peer-Reviewed basis

Golden Eagle Field Guide — Audubon Society Org. Report

RaptorMapper — Golden Eagle Habitat Decision Support Tool — Cal Poly Humboldt, University of Washington & Teton Raptor Center. Free interactive mapping tool; seasonal habitat models (nesting, non-nesting, migration), quantitative area analysis, downloadable GeoTIFF data. Wyoming focus. ◈ Research Tool

Rehabilitation & Conservation

"Dead birds flying": can North American rehabilitated raptors released into the wild mitigate anthropogenic mortality? — Hagen, C.A., Goodell, J.M., Millsap, B.A., & Zimmerman, G.S. (2024) · Wildlife Biology. DOI: 10.1002/wlb3.01283 Peer-Reviewed

Mortality Causes & Population Dynamics

Age-Specific Survival Rates, Causes of Death, and Allowable Take of Golden Eagles in the Western United States — Millsap, B.A., et al. (2022) · Ecological Applications 32(3), e2544. DOI: 10.1002/eap.2544 Peer-Reviewed ← Primary source for all mortality estimates on this page

Golden Eagle Population Trends in the Western United States: 1968–2010 — Millsap, B.A., et al. (2013) · Journal of Wildlife Management Peer-Reviewed

Wind Energy Impact Studies

Estimated golden eagle mortality from wind turbines in the western United States — Gedir, J.V., et al. (2025) · Biological Conservation. Peer-Reviewed ~ Bayesian Model

Estimated golden eagle mortality from wind turbines (PDF) — PNNL Tethys Database open-access archive Gov't Repository

Protect Eagles from Wind Turbine Fatalities — American Eagle Foundation ◈ Org. Report

Using Markets to Limit Eagle Mortality from Wind Power — Property and Environment Research Center (2022) ◈ Policy Analysis

Depredation & Ranching

Distribution and Magnitude of Eagle/Livestock Depredation in the Western United States — Phillips, R.L. & Blom, F.S. · Vertebrate Pest Conference Proceedings (University of Nebraska Digital Commons) Field / Agency Survey 143 ADC field personnel across 14 states; 10-year observational period.

Rancher-reported efficacy of lethal and non-lethal livestock predation mitigation strategies — Scientific Reports (Nature, 2017). DOI: 10.1038/s41598-017-14462-1 Peer-Reviewed

Spatial and Temporal Patterns in Golden Eagle Diets in the Western United States — Bedrosian, G., et al. (2017) · Journal of Raptor Research 51(3). Peer-Reviewed

Livestock-Predator Hub — UC Davis Rangelands ◈ Extension Resource

Effects of prey and weather on breeding Golden Eagles — Steenhof, K., Kochert, M.N., & Doremus, J.M. (1997) · The Condor 97(4):867–880. — Foundational study linking jackrabbit population cycles to eagle breeding behavior and prey-switching; basis for drought-depredation connection. Peer-Reviewed

Depredation by Eagles on Domestic Livestock — O'Gara, B.W. (1978) · Vertebrate Pest Conference Proceedings Vol. 8 — Age-based depredation behavior analysis; juvenile/subadult overrepresentation in livestock predation cases. Field Survey

Avery, M.L. & Cummings, J.L. (2004). "Livestock depredations by black vultures and golden eagles." Sheep & Goat Research Journal 19:58–63. — USDA Wildlife Services review; subadult-age eagles disproportionately represented in confirmed livestock kill cases. Gov't Research

Historical Depredation Research (Discovery Era)

Sheep Depredation by Golden Eagles in Montana — O'Gara, B.W. (1974) · eScholarship Field Survey

Golden Eagles — Scavengers and Predators on Domestic Lambs — Tigner, J.R. & Larson, G.E. (1981) · Wildlife-Livestock Relationships Symposium Field Survey

Eagles Research Summary (1994) — O'Gara, B.W. (retired USFWS) Agency Review

Federal Policy & Regulations

Eagle Permits Guide — U.S. Fish & Wildlife Service (Official) Gov't / Federal

50 CFR Part 22 — Eagle Permits — Electronic Code of Federal Regulations Gov't / Federal

Federal Register: Permits for Incidental Take of Eagles (2022 Update) Gov't / Federal

National Bald Eagle Management Guidelines — USFWS (PDF) Gov't / Federal

Eagle Permits Issued Under 50 C.F.R. 22 — Animal Legal & Historical Center ◈ Legal Analysis

Eagle Conservation Plan Guidance — USFWS (2010/2013 update). Covers take thresholds, territory assessment, floater pool dynamics, and allowable take modeling frameworks. Gov't / Federal

Bald and Golden Eagle Population Demographics and Estimation of Sustainable Take in the United States, 2016 Update — USFWS (2016). Contains ~31,800 western golden eagle population estimate underpinning all current take-limit calculations. Gov't / Federal

USDA APHIS Wildlife Services — Program Data Reports (PDR) — Annual animal removal data by species, method, state, and year. Filter for "Golden Eagle" to find eagle take data by state. Primary source for documented lethal control totals. Gov't / Federal

Livestock Indemnity Program (LIP) — USDA Farm Service Agency. 75% FMV compensation for livestock losses to federally protected species including eagles. 30-day notice of loss required; 60-day application deadline from end of program year. Gov't / Federal

Eagle Biology, Territory Fidelity & Population

The Golden Eagle — Watson, J. (2010, 2nd ed.). T&AD Poyser, London. The definitive comprehensive monograph on golden eagle biology, territory behavior, and conservation; foundational reference for territory fidelity and floater dynamics. Peer-Reviewed basis

Watson, J., Fielding, A.H., & Whitfield, D.P. (2000). "Golden eagle territory occupancy: effects of age, area, and habitat change." — Long-term Scottish data on territory turnover and vacancy periods following adult mortality; documents 2–7 year reoccupancy lags. Peer-Reviewed

Non-Lethal Deterrence Research

Protecting sheep from predators: Comparing guardian dogs and fox snares in Scandinavia — Kleiven, E.J., et al. (2017) · PLOS ONE 12(4): e0175593. DOI: 10.1371/journal.pone.0175593 — Includes review of visual deterrent habituation; applicable to raptor deterrence context. Peer-Reviewed

Predator control should not be a shot in the dark — Treves, A., et al. (2016) · Frontiers in Ecology and the Environment 14(1):14–17. DOI: 10.1002/fee.1228 — Systematic review finding most non-lethal deterrence studies lack controls and overstate effectiveness; gaps especially large for raptor species. Peer-Reviewed

Falconry Regulations

50 CFR § 21.82 — Falconry standards and permitting — e-CFR Gov't / Federal

Falconry Regulations (Cornell Legal) — Cornell Law School LII Gov't / Legal

International Eagle Austringers Association — Global Falconry Organization ◈ Org. Resource

Effects of Falconry Harvest on Wild Raptor Populations in the United States — Millsap, B.A. & Allen, G.T. (2006). Wildlife Society Bulletin 34(5):1392–1400. Peer-Reviewed
Deterministic matrix model across 8 raptor species. Golden eagle MSY harvest rate = 31% (juvenile passage); recommended cap = 5%. Floater:breeder ratio of 1.35 — highest of all species — provides large demographic buffer. Actual 2003–2004 harvest was <1% of juvenile cohort. USFWS-authored.

🗂️ ANPR — Proposed Eagle Captive Breeding Rule (never finalized)
Migratory Bird Permits; Changes in the Regulations Governing Raptor Propagation — Dr. George T. Allen, USFWS Division of Migratory Bird Management. Federal Register Vol. 76, No. 129 (July 6, 2011). Document No. 2011-16877. Gov't / Federal ANPR
Advance Notice of Proposed Rulemaking asking whether golden and bald eagles should be allowed under captive propagation permits — the only MBTA-protected raptors currently excluded. Solicited public comment on 10 regulatory questions. No final rule was ever issued; prohibition remains in effect.
📄 PDF full text | Federal Register entry

🟢 Research Era: 2011-Present

🔬 HawkWatch International: Migration & Nesting Monitoring

TL;DR

30+ years of migration count data; recent nesting seasons show the lowest reproductive success in 40 years of monitoring in the study areas tracked
50% of nestlings die in their first year; 73 vehicle strike deaths documented in 5 years
Long-term monitoring provides regional context for single-year mortality studies — the species remains roughly stable range-wide, with documented local declines in some regions

HawkWatch International, based in Salt Lake City, Utah, operates one of the longest-running golden eagle migration monitoring programs in North America. Since 2011, they've conducted intensive studies on golden eagle nesting, survival, and the emerging threat of vehicle strikes. Their 30+ years of migration data signal concern and population pressure in the regions they monitor — golden eagles are considered roughly stable range-wide, with documented local declines in some areas.

30+

Years Migration Data

50%

Nestling Dies 1st Yr

Vehicle Strikes (5yr)

40 years

Lowest Nesting Success in Study Areas

📊 Migration Monitoring Program

30+ Years of Continuous Data:

Annual fall migration counts at multiple observation sites
Population trend data for broader geographic regions
Migration data signaled local population pressure in monitored flyways beginning in 2011
Geographically-specific population trend interpretation

⚠️ Recent Nesting Pressure

🚨 Recent Nesting Seasons: Lowest Reproductive Success in 40 Years of Local Monitoring

HawkWatch's data shows reduced golden eagle reproductive success in the areas they monitor. Recent nesting seasons yielded the lowest survival rates in the last four decades of this monitoring program—a finding documented through GPS transmitter tracking of nestlings in the Utah Test and Training Range study area. This signals real local pressure; range-wide, golden eagle numbers are considered roughly stable, with documented declines in some regions. Field Survey

The Crisis Details: HawkWatch Int'l GPS Studies

Mortality Rate: ~50% of transmitter-equipped nestlings die in first 12 months (GPS telemetry data; sample size varies by year — consult HawkWatch Int'l for current n)
Primary Cause: Jackrabbit population collapse (main eagle food source in Great Basin)
Result: Nestling starvation and inadequate nutrition during critical growth period
Documentation: Solar-powered GPS transmitters reveal which eagles survive and where they die — data publicly available on Movebank

🛰️ GPS Tracking Technology

Revolutionary Monitoring Technology

HawkWatch equips golden eagle nestlings with solar-powered GPS transmitters the size of a matchbox. This technology tracks movement, survival, and habitat use in real-time—revealing not just WHERE eagles die, but HOW and WHY.

🚗 The Vehicle Strike Crisis

⚡ An Emerging and Growing Threat

One of HawkWatch's most important discoveries: golden eagles scavenging on roadkill are frequently struck by vehicles. This threat was unknown before GPS tracking revealed it.

Eagle Vehicle Strike Findings:

5-Year Count: 73 documented golden eagles struck by vehicles
Actual Number: Likely much higher than documented
Discovery Method: GPS transmitters revealed eagles near roads
Behavior: Eagles attracted to roadkill, struck while feeding/taking off
Research Status: Ongoing study with cameras placed on carcasses

Mitigation Strategy Under Development

HawkWatch is testing whether relocating roadkill farther from roads can feed scavenging eagles while reducing vehicle strike risk. Early results show promise in reducing eagle-vehicle collisions.

🤝 Scale of Research Effort

Largest Golden Eagle Nesting Study in the West:

Partnerships: Department of Defense, Hill Air Force Base, Utah Test and Training Range, Dugway
Many research sites on military installations
Banding Program: USGS aluminum bands for adults and nestlings
Data Sharing: Public tracking database (Movebank) with individual eagle records

📈 Research Summary

2011

Intensive Studies Begin

Migration data signaled local population pressure, prompting intensive nesting research

2013+

GPS Transmitters

Solar-powered tracking devices placed on nestlings for real-time monitoring

2020s

Vehicle Strike Crisis

Tracking data revealed emerging threat of roadkill-related vehicle strikes

Ongoing

Solutions Testing

Testing carcass relocation and other mitigation strategies

HawkWatch International Resources

Golden Eagle Programs - HawkWatch International (Main Hub)

Eagle Vehicle Strike Project - HawkWatch International

Golden Eagles Research & Updates - HawkWatch International

Utah West Desert Management Recommendations (2013) - PDF

HawkWatch Golden Eagles Tracking Data - Movebank (Public Database)

Golden Eagle Use of Winter Roadkill - Journal of Wildlife Management

📚Primary Research Sources