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American Museum of Natural History
amnh.org
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Does the summer heat make you feel like the bald-headed uakari (Cacajao calvus)? Scientists think that the bright color of this Amazonian primate’s face may actually be an indicator of health—and that individuals with lighter faces are less desirable as mates.
Photo: DC_Colombia, iStock
2026-07-03T14:58:25.020Z