Figure 2 | Scientific Reports

Figure 2

From: The transition from the female-like great calls to male calls during ontogeny in southern yellow-cheeked gibbon males (Nomascus gabriellae)

Figure 2

Representative spectrogram indicating the following: (A) duet bouts between an adult male and an adult female, with an offspring that produces a female-like “great call”; and (B) a young male emits a male call as a solo song after duet bouts. The red arrows indicate female-like "great calls" emitted by young males in co-singing interactions with their mothers.

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