Red squirrels

Unfortunately not. Grey squirrels compete more successfully than red squirrels for food and habitat. They are larger and more robust, and can digest seeds with high tannin content, such as acorns, more efficiently. This forces red squirrels into other areas where they can find it more difficult to survive. 

Grey squirrels also transmit a squirrelpox virus which can normally kill red squirrels. Once infected, red squirrels often die of starvation or dehydration.

The grey squirrel is the main reason for the decline of the red squirrel. Habitat loss has also contributed to the red squirrel’s decline. This occurs when areas of woodland are destroyed or become separated by development and changing land-use. This leads to isolated areas which cannot sustain viable populations of wildlife, including red squirrels in some places. Squirrelpox virus is fatal to red squirrels but is carried by grey squirrels without causing them any harm.

This virus, carried by grey squirrels without causing them harm, is fatal to red squirrels and once infected red squirrels often suffer a slow and painful death. The virus produces scabs and sores in and around the eyes, nose, mouth, feet, ears and genitalia. The infected squirrel is very quickly unable to see or to feed properly and rapidly becomes dehydrated and malnourished. 

A vaccine against squirrelpox is in development but it could be many years before this is available in the affordable and easily dispensable form necessary to assist red squirrel conservation. Targeted and co-ordinated grey squirrel control to keep densities of grey squirrel very low in carefully chosen areas is used to combat the spread of disease.

Natural England is the the government's adviser for nature conservation in England. It's 'Review of red squirrel conservation activity in northern England (2009)' is the most comprehensive review of the science to date.

Other reading:

Conservation Plan for Red Squirrel Conservation (2009)

Scottish Strategy for Red Squirrel Conservation (2015)

Red Squirrel Conservation Action Plan (1999)

As the historic loss of red squirrels from much of Ireland, England, and Wales shows, non-intervention would lead to further loss of red squirrels ultimately ending in their extinction on the UK mainland. Evidence shows that without conservation management red squirrels are at risk of becoming extinct in England and Scotland (1).

Research by NUI Galway has shown that a high-density of Irish pine marten populations is causing corresponding populations of grey squirrels to collapse, with a recovery of red squirrels following. A new project has been launched by the University of Aberdeen to investigate whether the same effect is occurring in Scotland in areas where the pine marten is recovering, where differences in ecological conditions may make the outcome different to that in Ireland. The project will run until the end of 2017 and is led by Dr Emma Sheehy and Professor Xavier Lambin. This area of research is of interest but at the moment the fledgling recovery of the pine marten cannot be sole prospect for survival of our red squirrel due to its relatively low population densities.