Yawning in an Old World Monkey, Macaca nigra (Primates: Cercopithecidae)

@article{Hadidian1980YawningIA,
  title={Yawning in an Old World Monkey, Macaca nigra (Primates: Cercopithecidae)},
  author={John Hadidian},
  journal={Behaviour},
  year={1980},
  volume={75},
  pages={133-147}
}
The yawn of the black ape appears to be structurally homologous to the behavior pattern widely described for other vertebrates, even in its finer details. The pattern is highly stereotypic, showing only minor structural variants and not exhibiting any tendency to grade continuously into other expressive or communicative behavior patterns. The yawn occurs in many different contexts, in association with a variety of social and nonsocial situations. Yawns tend to be occur in contexts which elicit… Expand

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