Fig 3. Proportion of citizen science (CS) papers from this review (red point) relative to the proportion of global richness in the Catalogue of Life (grey bars) by taxa and number of global occurrence in GBIF (green bars), for (a) vertebrates and (b) invertebrates; (c) proportion of CS papers by data collection region (red dotted lines) relative to each region’s fraction of the Earth’s land area (grey bars); and (d) proportion of CS papers by country.