Naturally Occurring Primate Hybrid

@article{Bernsteil1966NaturallyOP,
  title={Naturally Occurring Primate Hybrid},
  author={Irwin S. Bernsteil},
  journal={Science},
  year={1966},
  volume={154},
  pages={1559 - 1560}
}
Two members of a troop of wild Macaca irus in Malaysia have been tentatively identified as hybrids of M. irus and M. nemestrina. Mechanisms prohibiting such hybridization in the natural habitat may have broken down under heavy predation pressure which finally resulted in the local extermination of M. nemestrinia. 
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Functional affinities of man, monkeys, and apes
Research supported by NSF grant G-3008 and NIH grant FR-00165