Osteohistological studies of extant aves, and in particular the paleognaths, illuminate aspects of extinct dinosaur biology previously thought unattainable, like metabolic regime (Castanet et al., 2000;Cubo et al., 2016), biomechanics (de Ricqlès et al., 2000, and even fossil preservation rate (Marshall et al., 2021). These insights are predicated on studies demonstrating a one-to-one correspondence between arrested growth lines and chronological age (e.g., de