Data used in Langhammer et al, which is a meta-analysis by authors: Penny F. Langhammer, Joseph W. Bull, Jake E. Bicknell, Joseph L. Oakley, Mary H. Brown, Michael W. Bruford, Stuart H. M. Butchart, Jamie A. Carr, Don Church, Rosie Cooney, Simone Cutajar, Wendy Foden, Matthew N. Foster, Claude Gascon, Jonas Geldmann, Piero Genovesi, Michael Hoffmann, Jo Howard-McCombe, Tiffany Lewis, Nicholas B.W. Macfarlane, Zoe E. Melvin, Rossana G. Merizalde, Meredith G. Morehouse, Shyama Pagad, Beth Polidoro, Wes Sechrest, Gernot Segelbacher, Kevin G. Smith, Janna Steadman, Kyle Strongin, Jake Williams, Stephen Woodley, Thomas M. Brooks