The Importance of Conserving Red Squirrels

The increase of grey squirrels has drastically decreased our native red squirrel numbers in England to the point where there are only a few small pockets of red squirrels remaining

Grey Squirrel

Since its introduction to the UK in the 1880’s the grey squirrel has steadily expanded north and like so many species introduced by man it has had a detrimental effect on our flora and fauna. The increase of grey squirrels has drastically decreased our native red squirrel numbers in England to the point where there are only a few small pockets of red squirrels remaining. Red squirrels are still relatively abundant in Scotland. However grey squirrels continue to expand their range and they now feature in the IUCN’s list of the 100 worst invasive species in the world. If they continue to spread there may come a time when red squirrel numbers fall below the point of recovery and the species may become extinct in the UK.

So why do grey squirrels have such a negative effect on red squirrels? In mixed woodlands and broadleaf forests grey squirrels have many behavioural advantages that allow them to out-compete red squirrels. This leaves fewer resources for reds, resulting in reduced fitness and lower breeding success. Grey squirrels are also known to carry the parapox virus which does not affect them but is known to be fatal in reds. This virus has only been found once in Scotland but has been responsible for many red squirrel deaths in England.

There is a big effort being made to conserve red squirrels, one method of which is culling. Culling of animals as a means of population control is particularly controversial, however it is a necessity if we are going to conserve red squirrels and right now it is the only effective means by which we can control grey squirrel numbers. It is also important to conserve large coniferous forests as red squirrels are not out-competed in this habitat, which is still abundant in Scotland. Lastly there is a significant amount of effort being put into monitoring our squirrel populations and by keeping a close eye on squirrel numbers we are able to establish whether or not our current conservation efforts are effective. Hopefully we will not see any further decline in red squirrel numbers in Scotland.



  • I enjoyed reading this article and found it interesting 🙂 One thing I am still not sure of though is why exactly it is important to conserve Red Squirrels. I understand that they are endangered but besides conserving them for the sake of preserving the species in the UK, does it have any wider significance? If they were gone would it have an adverse affect on anything else? I do not mean to sound negative, I’m simply very curious! If you can answer me please let me know.

    Ewan 22nd November 2011 at 9:10 pm Reply
  • Ewan,

    grey squirrels require nearly ten times as much food per acre as reds do. Grey squirrels also breed slightly faster and live slightly longer. Simply put, greys are more destructive than reds, to timber crops, bird numbers, and other things.

    Reece 10th July 2012 at 3:51 pm Reply
Leave a Comment

Your email address will not be published.*

Tick the box or answer the captcha.

You might also like

  • Squirrel Pox Could Threaten Scotland’s Red Squirrels

    The squirrel parapoxvirus is mostly asymptomatic in its grey host; it has little or no effect. However, once the virus is transmitted to their red cousin it causes the fatal disease known as “squirrel pox”.

    By Richard Hassall
  • Is There Hope for Conservation?

    James Borrell’s recent TEDx talk on conservation achievements so far. Should we be more optimistic in conservation? Get involved with the debate.

    By Guest Bloggers
  • British Mammals Extinction Risk

    A report launched by The Mammal Society and Natural England is the first comprehensive review of British mammals for 20 years. It found almost one in five species face a high risk of extinction.

    By Alex Taylor