Skip to main content
Contact Us

Management of grey squirrels

Home research Management of grey squirrels


mgsq_greysquirrelonoak.jpgSince their introduction into Britain between 1876 and the 1920’s, grey squirrels have spread rapidly, gradually displacing the native red squirrel in most of England and Wales, and in central and south-east Scotland.

Grey squirrels are extremely destructive in woodlands, stripping bark from the main stem and branches of trees.

Red and grey squirrel distribution from 1998 data
Enlarge map (600x732px : 43K)
Enlarge map (large) (1368x1668px : 79K)



Research objectives

The overall aims of this research programme included:

  • Investigating the impact of grey squirrels on woodlands and the reasons for bark stripping behaviour
  • Identifying efficient control strategies, including new trapping methods, contraception and natural predation
  • Promoting and supporting best practice management for the control of grey squirrels and their impacts.

Specific objectives included:

  • Support evidence based policy development at national and regional levels
  • Investigating the hypothesis that bark stripping behaviour by grey squirrels may be motivated by a calcium deficiency in their diet.
  • Assessing impacts of the introduced grey squirrel on sustainable woodland management
  • Investigate changes in numbers and behaviour of grey squirrels in response to pine martens
  • Investigating novel and develop improved methods of population control, including reviewing the potential use of attractants
  • Monitoring developments (worldwide) in the use of immuno-contraceptives for mammal population control, and consider their potential application to grey squirrel control (see reproductive inhibition in grey squirrels)
  • Investigating alternative methods of damage limitation such as stand management, and the development of physical and chemical deterrents
  • Providing practical advice to the forest industry and the general public and promote best practice by supporting training seminars and workshops on grey squirrel control for woodland owners and managers.

What's of interest

"Invasive species, threatening biodiversity in Europe"
IAS news video

Related pages

Useful sites

Further reading

Forestry Commission and other publications covering the management of grey squirrels. Some are available for downloading.

Research Status
Research Groups
Forest genetics
Vertebrate Ecologist
Forestry Staff RobinGill.034a0af4.fill 600x600 1