Final answer:
A mature stallion does not stand at 18 hands at the withers.
Step-by-step explanation:
The given statement is False. A mature stallion does not stand at 18 hands at the withers. The term 'hands' is a unit of measurement used for horses, where one hand is equal to 4 inches. So, if a stallion stands at 18 hands, it means its height at the withers is 72 inches or 6 feet. However, the average height of a mature stallion at the withers is typically between 14.2 to 16.2 hands.
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