There are two species of squirrel in the United Kingdom: red squirrels and gray squirrels. Red squirrels are native to the United Kingdom while gray squirrels were introduced to the United Kingdom from North America in 1876. Figure 1 show the distributions of the two squirrel species in 1945 and 2010.

The grey squirrel has increased their rate of emigration to the UK

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igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.