Senior Research Fellow
Small population recovery
Contact details

Institute of Zoology
Zoological Society of London
Regent's Park
United Kingdom

Tel: 020 7449 6327

Google Scholar

John Ewen's research focuses on small population recovery, often involving conservation translocation, and the decision science that packages this.

He enjoys working with recovery teams on solutions to complicated decisions starting from being explicit in our values (expressed as objectives) and then using our science to ensure we best achieve them. One of his mottos is 'science doesn’t make decisions, it informs them'.

Although he works across a broad range of species, he has been most closely involved with hihi, a threatened passerine species found in New Zealand. 

Current projects



  • Ewen, J.G., Armstrong, D.P., Parker, K. & Seddon, P. (Editors)(2012). Reintroduction Biology: integrating science and management. Blackwell Publishing.

Recent Representative Papers

  • Ewen, J.G., Walker, L. Canessa, S. & Groombridge, J.J. (2014) Improving supplementary feeding in species conservation. Conservation Biology (in press)
  • Ewen, J.G., Soorae, P.S. & Canessa, S. (2014) Reintroduction objectives, decisions and outcomes: global perspectives from the herpetofauna. Animal Conservation (in press)
  • Walker, L., Ewen, J.G., Brekke, P. & Kilner, R.M. (2014) Sexually selected dichromatism in the hihi Notiomystis cincta: multiple colours for multiple receivers. Journal of Evolutionary Biology DOI: 10.1111/jeb.12417
  • Walker, L., Thorogood, R., Karadas, F., Raubenheimer, D., Kilner, R. & Ewen, J.G. (2014) Foraging for carotenoids; do colourful male hihi target carotenoid-rich foods in the wild? Behavioural Ecology DOI: 10.1093/beheco/aru076
  • Seddon, P., Moehrenshlager, A. & Ewen, J.G. (2014) Reintroducing Resurrected Species: Selecting DeExtinction Candidates. Trends in Ecology and Evolution 29: 140-147 (with cover image).