A–E: Four attempts at modelling FL and BWT of greenbone (A to E), and the relationship between GWT and BWT (F). A. From Ritchie (1969) and his suggested linear best fit lines for male and female specimens. B, C. Red dots from Paul et al. 2000 and their suggested logarithmic line of best fit. Green dots superimposed are from Crabb’s study (1993), no line fitted. D. Yellow dots this present analysis. E. Yellow dots from Trip et al. (2014), see text. F: red dots linear relationship between GWT and BWT, see text.