Beyond traditional hypotheses of acoustic signaling and visual display, could the convergent evolution of hollow cranial crests in lambeosaurine hadrosaurids (e.g., Parasaurolophus, Corythosaurus) also reflect thermoregulatory, respiratory, or species-specific physiological adaptations? How can modern methods (computational fluid dynamics, stable isotope geochemistry, and synchrotron imaging) be applied to test these possibilities?