Protected areas facilitate species' range expansions. by Thomas, C, Gillingham, P, Bradbury, R, Roy, D, Anderson, B, Baxter, J, Bourn, N, Crick, H, Findon, R, Fox, R, Hodgson, J, Holt, A, Morecroft, MD, O'Hanlon, N, Oliver, T, Pearce-Higgins, J, Procter, D, Thomas, J, Walker, K, Walmsley, C, Wilson, R, Hill, J