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Releasing grey squirrels into the wild
  1. C. M. Shuttleworth,
  2. S. Bertolino,
  3. R. Gill,
  4. J. Gurnell,
  5. M. W. Hayward,
  6. R. E. Kenward,
  7. C. Lawton,
  8. P. W. W. Lurz,
  9. C. J. McInnes,
  10. A. Mill,
  11. S. Trotter and
  12. L. A. Wauters
  1. School of Natural Sciences, Bangor University, Bangor, Gwynedd LL57 2UW
  2. Department of Life Sciences and Systems Biology, University of Turin, Via Accademia Albertina 13, 10123 Torino, Italy
  3. Centre for Ecosystems, Society and Biosecurity, Forest Research, Alice Holt Lodge, Farnham, Surrey GU10 4LH
  4. School of Biological and Chemical Sciences, Queen Mary University of London, London E1 4NS
  5. School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
  6. International Union for Conservation of Nature, 28 Rue Mauverney, 1196 Gland, Switzerland
  7. School of Natural Sciences, Ryan Institute, National University of Ireland, Galway, Ireland
  8. Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Campus, Midlothian EH25 9RG
  9. Moredun Research Institute, Edinburgh EH26 0PZ
  10. Centre for Wildlife Management, School of Biology, Ridley Building, Newcastle University, Newcastle upon Tyne NE1 7RU
  11. UK Squirrel Accord's Red Squirrel Conservation Committee, Plumgarths, Crook Road, Kendal, Cumbria LA8 8LX
  12. Department of Theoretical and Applied Sciences, Università degli Studi dell’Insubria, Varese, Italy
  1. email: craig.shuttleworth{at}

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The introduced grey squirrel is a highly invasive and economically damaging species

We were surprised to read Maureen Hutchison describe the evidence that North American eastern grey squirrels (Sciurus carolinensis) have negative impacts on European biodiversity as ‘opinions’ that are ‘opposed by many experts on the subject’.1 A recent peer-reviewed monograph,2 with over 50 international scientific contributors, presented overwhelming evidence that the introduced grey squirrel is a highly invasive and economically damaging species.

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