Extended Data Fig. 3: Curvilinear relationship between brain and body mass across birds.
From: Co-evolutionary dynamics of mammalian brain and body size
a, Slope coefficients (and percentiles of posterior distributions plotted as transparent lines) for each major avian group plotted against the average body mass for that group (percentiles of body mass range plotted as transparent lines). Slope coefficients were estimated from a multiple-slopes variable rates regression model run identically to the multiple-slops model presented for mammals. b, The median model predictions for our curvilinear BBM relationship across all birds from the variable rates regression model (black) compared to the multiple-slope model predictions. The curvilinear model is statistically supported.
