Fig. 14

Violin plots depicting the distribution of life history traits in the three major amniote clades. Means are represented as solid white points. Productivity expressed as the ratio of productivity (brood size × brood frequency × offspring size) over adult body size to standardize for body size. Red: birds, blue: squamates, yellow: placental mammals. (See Additional file 2: Figure S1 for graphs that also include marsupials and turtles)