T. Ryan Gregory, doctoral candidate at the University of Guelph (Canada), provides this comprehensive data catalog of animal genome size. Included on site are haploid genome sizes (C-values) for approximately 2,100 species or subspecies of vertebrates and 800 species of invertebrates. Organized by taxa, this Website-in-progress will be of direct use to those researchers whose study organisms are represented here. Continual additions are planned as more data become available.