How did the existence of dry spells in its environment influence the required robustness of Xenoceratops's anatomy?

It necessitated a more powerful fermentation process internally to handle drier, tougher vegetation

Living in a subtropical region characterized by seasonal shifts, including dry spells, meant Xenoceratops had to contend with periods when vegetation became tougher and less nutritious. When water was scarce, the food quality decreased. This environmental pressure likely demanded that both the physical processing tools (the beak and dentition) and the internal digestive system be robust enough to handle this tougher material. Specifically, a more powerful fermentation process relying on gut microflora would be required to efficiently extract nutrients from less palatable and harder-to-process dry forage, ensuring survival through lean seasons.