Members of the public are being encouraged to support the ‘All-Ireland Squirrel and Pine Marten Survey’ to help track some of our most iconic woodland mammals – the red squirrel, the grey squirrel and pine martens.
Members of the public are invited to record their sightings of the three species throughout 2026, helping researchers build a detailed picture of how their populations are changing.
The red squirrel is Ireland’s only native squirrel species, once widespread in forests and wooded areas. The introduction of the grey squirrel in 1911 has had devastating consequences on our native species through disease and competition for food, leading to the disappearance of red squirrels from large parts of the country.
PINE MARTENS AID RED SQUIRREL COMEBACK
For many years, the future of the red squirrel looked bleak. However, recent surveys have revealed a remarkable and unexpected turnaround, with the grey squirrel being knocked back in certain areas, and the reds showing signs of recovery. In several regions, grey squirrel numbers have declined sharply, while red squirrels are showing encouraging signs of recovery.
Research linked this shift to the successful comeback of another native species, the pine marten – tree dwelling carnivores and one of the few predators that can successfully hunt grey squirrels. Because the red squirrel evolved alongside pine martens, they are better adapted to avoiding them and can escape danger more easily.
ABOUT THE SURVEY
Led by researchers in University of Galway, Ulster Wildlife and the Vincent Wildlife Trust, the survey aims to map the latest distribution of red and grey squirrels, and the pine marten across the island of Ireland.
The 2026 survey is being delivered with the support of the National Biodiversity Data Centre in the Republic of Ireland and CEDaR in Northern Ireland.
Sightings of all three mammals can be recorded on the online survey form www.biodiversityireland.ie. The survey is part of a long-running monitoring programme, with previous surveys carried out on four occasions since 1997, providing vital insights into long-term trends and conservation success.
Vicky Knight, Species Conservation Officer at Vincent Wildlife Trust, said:
“This survey is a fantastic opportunity for people across the island of Ireland to get involved and help improve our understanding of these woodland species. At this time of year, it’s also important for householders to make sure their attics are pine marten-proof. Pine martens would typically den in old tree cavities, but because these natural sites are scarce in Ireland, they are increasingly using buildings in which to rear their young.
“If you have recently spotted a pine marten around your home or garden, now is the time to check your attic and ensure it is secure. Practical advice on making your home pine marten-proof, along with other information about the species, is available at www.pinemarten.ie, a national resource dedicated to pine martens in Ireland.”
