Grey Squirrel (Sciurus carolinensis) are not native to the United Kingdom, they were introduced from the United States of America between 1870 and 1930. The grey squirrel is around 23-30cm in length, and has a tail measuring19-25 cm. Its flanks and tail are grey with reddish patches on it back and face, it has small ear tufts and is larger than the native Red Squirrel. They feed mainly on acorns, tree shoots, fruits, roots and tree sap, stripping back the bark and causing damage to trees. The placement of bird feeders may encourage squirrels into the garden.
Noises are often heard as they move around the attic space, with a peak of activity first thing in the morning and after sunset. Structural damage to properties can be caused by the squirrel gnawing through wood, electrical cables and water pipes, which can lead to possible fire or flooding.