The vocal organ of the Howling monkey (Alouatta palliata)

@article{Kelemen1960TheVO,
  title={The vocal organ of the Howling monkey (Alouatta palliata)},
  author={George Kelemen and Jacob Sad{\'e}},
  journal={Journal of Morphology},
  year={1960},
  volume={107}
}
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References

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VI. Zoology of Mycetes Seniculus
TLDR
The Howlers belong to the American group of broad-nosed, prehensile-tailed monkeys, which are much lower in structure than the man-like apes, and are said to be developed to a great extent in the male.