Red Squirrel – Sciurus vulgaris
Despite historically high numbers, the introduction of grey squirrels during the early 20th century greatly contributed to red squirrel decline through disease transfer and indirect competition (better foraging efficiencies). The only certain way to sustain red squirrel populations is through the exclusion of grey squirrels. This can be achieved through the creation of habitats favourable for only red squirrels, selective feeders or lethal exclusion. To improve the success of reintroductions further research is required.