Fig. 1.

(A) Outline of the process of quantifying the total biomass of all wild land mammals (SI Appendix, Fig. S3). (B) The number of species and total biomass of all wild land mammals by estimation method. For 392 species, global population reports are available (green). The total mass of each of the remaining 4,413 species (blue) was estimated using our model. The 392 species were not selected randomly, but selected based on data availability. This dataset therefore tends to contain more large-bodied species at greater risk of extinction, or species with a small range compared to the species where no global abundance data are available (Materials and Methods). Our estimate excludes ≈1,500 known wild land species for which there is a lack of range data due to scarcity and lack of research. We estimate their global biomass to be negligible, since their abundance is typically low.