Grey Squirrel (Scuirius carolinensis), non native, introduced species, a threat to the survival of the native Red Squirrel

Grey Squirrel (Scuirus carolinensis) being dissected to show volunteers how the virus is passed from Grey Squirrels to Red Squirrels. Part of the Red Squirrels Trust work in involving and informing volunteers to carry out conservation work, to remove Grey Squirrels from theecosystem, in Clocaenog Forest, Wales.