Overview
- Male proboscis monkeys have significantly larger nasal cavities than females, aiding in louder and deeper calls.
- These calls help males assert dominance and attract females in dense forest environments.
- The nasal cavity shape allows for resonance, enhancing the monkeys' ability to emit high-intensity sounds.
- Older males have larger noses, correlating with their dominance status and reproductive success.
- The study used 3D scans of skulls to uncover the evolutionary benefits of the monkeys' enhanced nasal structures.