What physical feature distinguishes adult male vervet monkeys?
Answer
A bright blue scrotum
Adult male vervet monkeys possess a bright blue scrotum that serves as an exaggerated sexual signal. This coloration contrasts sharply with the appearance of females and acts as a visual indicator of male quality or dominance. Such traits are common in primates and play a significant role in intrasexual competition and the process of mate selection within the troop.

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