Discrimination of macaques by macaques: the case of Sulawesi species

@article{Fujita2006DiscriminationOM,
  title={Discrimination of macaques by macaques: the case of Sulawesi species},
  author={Kazuo Fujita and Kunio Watanabe and Tri Heru Widarto and Bambang Suryobroto},
  journal={Primates},
  year={2006},
  volume={38},
  pages={233-245}
}
A series of work by the first author have demonstrated that many macaque species show a visual preference for the pictures of their own species when the monkeys actively press a lever to see the pictures. We expanded this study to Sulawesi macaques kept as a pet by local people with slight modification. All seven species of Sulawesi macaques were passively exposed to a variety of colored slides of Sulawesi macaques. The experimenter recorded the duration of visual fixation onto the pictures… 
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