A type of large, short-tailed monkey from the Amazon rainforest with a distinctive bare, colorful face.
From Tupi or Amazonian indigenous language, meaning an unattractive or bald-faced creature. The name references the monkey's unusual facial appearance.
The cacajao's bright red face has no fur—it's used like a mood ring to show emotions and status within their group, turning their 'ugly' appearance into sophisticated social signaling among Amazon monkeys.
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