Fig. 6

Allometry of brood size. From left to right; a Aves (red: Neoaves, blue: Galloanserae, yellow: Palaeognathae), b Reptilia (red: Sauria, blue: Testudines, yellow: Serpentes) and c Mammalia (red: Eutheria; blue: Metatheria). Solid lines are regression slopes from PGLS analysis for Aves and Squamates. For Mammalia, regression lines are from a Generalized Additive model with knots (k = 10)