FIGURE 5.

Eggshell C numbers of the 1350 avian species studied and the estimated values for their ancestors with separate evolution trends in passerine and non‐passerine birds along the avian phylogenetic tree. The blue solid and two blue dashed lines fit to locally polynomial spline curves for the medians and 5th and 95th percentiles of non‐passerine egg C numbers respectively; the red lines are for passerines. The two grey bands indicate the two major adaptive radiation events in modern bird evolution