Studies from which 40 cases were extracted for meta-analysis, showing predator species, prey species and a range of coded † information used in the sub-group analyses.

Citations in italics are studies that hold data that is non-independent to those from which the data in the analyses was extracted.
Multiple refers to the removal of corvid, mustelid, fox, and other mammal and bird predators. †Codes: Gr/Gu/W–prey family Grouse/Gulls/Waders; R/A/ND–prey designation - red/amber/no designation (following the red and amber lists of Gregory et al. (2002)); Co/Pa/Pr–prey abundance measure–counts/breeding pairs/productivity; GK/NGK–game keeper/no game keeper sites; Is/M–island/mainland; S/T - spatial/temporal; BA/CE/FS–study design - before and after predator invasion/controlled experiment/field study with removal. The * denotes cases that could not be included in any of the groups of the categorical analysis.