Grey Squirrels are a non-native species from America that were introduced to the UK in Cheshire in 1876.

Unfortunately grey compete with red squirrels for food and also carry a virus known as squirrelpox. The grey squirrels are actually immune to the disease, however, they transmit it to reds, for whom it is fatal.Greys can also affect native woodland by bark stripping and eating the seeds of certain and cause significant damage by gnawing on wood and electrical wiring. 

The grey squirrels breed twice a year. The first litter is born Feb-Mar and the second in June-July. The gestation period is around 44 days and the young are weaned at around 7 weeks.