Figure 4. The scaling relationship between body size and species abundance. The power law shown here for mammals also extends to various ectotherms and bacteria (White et al., 2007). While the number of ancient humans agrees with this relationship, modern humans and domesticated animals deviate by five orders of magnitude from the predicted abundance for our mass (Kapitza, 1999). The increase and limitations are argued to be set by information exchange between humans rather than by environmental resources (Kapitza, 1999). The figure is created based on data from (Kapitza, 1999).