What contrasts sharply with the emperor tamarin's white mustache?
Answer
The otherwise drab coloration of their head and face
The impressive visual signature of the emperor tamarin is defined by the dramatic contrast created by its facial hair. While the white mustache sweeps down prominently from the upper lip, it stands in sharp opposition to the otherwise drab coloration that covers the remainder of the tamarin's head and face area, making the mustache highly conspicuous.

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