Compression efficiency against heterozygosity resolves non- human populations. Compression efficiency (y-axis) against heterozygosity (x-axis) for the four non-human data sets: (A) cattle (n = 1,800), (B) sheep (n = 1,222), (C) mouse (n = 49) and (D) dog (n = 83). The discrimination afforded by genome-wide compression efficiency and heterozygosity is effective in all species under consideration. Inclusion of wild as well as domestic populations shows the compression efficiency is sensitive to selection pressures, past effective population sizes, pedigree structures, different heterozygosities and different levels of linkage disequilibrium. The Brahman are the only Indicine cattle in panel A, the remainder being Taurine breeds.