Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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An estimate of abundance and an assessment of the efficacy of sterilization techniques for the control of wild burro populations


February 2015 - March 2018


Feral burro populations have increased in numbers and are impacting fragile desert plant communities, reducing forage availability for domestic livestock and wildlife as well as seeking forage and water near human habitations, which brings them into conflict with humans. Fort Irwin, California has a relatively large population of burros (~1,000) that enter into the cantonment area, resulting in human-wildlife conflicts. We propose to estimate the size of the burro population, examine patterns of space use and employ non-lethal methods of immunocontraception or sterilization to reduce recruitment into the existing population in an attempt to reduce population size.

Research Products and Activities

Technical Publications

  • Reddell, C.D., T.K. Karish, G.W. Roemer, and J.W. Cain III. 2016. Investigations into the control of coyote and feral burro populations on the National Training Center Fort Irwin, California. Annual Progress Report to U.S. Army Construction and Engineering Research Laboratory and Fort Irwin National Training Center.Abstract |


  • Karish, T., G.W. Roemer, and J.W. Cain III. 2017. Resource selection and movements of feral burros on the Fort Irwin National Training Center. 24th Annual Conference of the Wildlife Society, Albuquerque, New Mexico, USA. (POSTER)

Current Staff

Federal Staff: 95

Masters Students: 239

Phd Students: 142

Post Docs: 53

University Staff: 240

5 Year Summary

Students graduated: 701

Scientific Publications: 1936

Presentations: 4260



  • James CainCo-Principal Investigator
  • Gary W. RoemerPrincipal Investigator
  • David DelaneyNon-PI Collaborator
  • Talesha KarishStudent

Funding Agencies

  • Department of Defense, Fort Irwin


Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey