Why do the massive horns of Arsinoitherium argue against a constantly submerged lifestyle?
Answer
They are better suited for display or combat contests requiring stable footing
The physical attributes of the massive horns suggest a strong connection to social behaviors typically performed on land or stable ground. These structures appear suited for display or engaging in shoving matches between males, much like rhinoceroses engage in contests of strength. Such physical contests require solid footing to support the applied force. If Arsinoitherium were perpetually submerged or engaged in combat within deep, viscous mud, the utility of these large, keratinous weapons would be greatly diminished, suggesting that terrestrial interaction, at least for social purposes, was a significant part of its existence.
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