The red squirrel or Eurasian red squirrel (Sciurus vulgaris) is a
species of tree squirrel in the genus Sciurus common throughout Europe
and Asia. The red squirrel is an arboreal, primarily herbivorous rodent.
In Great Britain, Ireland, and in Italy numbers have decreased
drastically in recent years. This decline is associated with the
introduction by humans of the eastern grey squirrel (Sciurus
carolinensis) from North America. However, the population in Scotland is
stabilising due to conservation efforts, awareness and the increasing
population of the pine marten, a European predator that selectively
controls grey squirrels.