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Spontaneous Tumours in Howler Monkeys


DURING 1965 we conducted post-mortem examinations on 292 free ranging howler monkeys (Alouatta caraya, Humboldt, 1812)1 and found fourteen tumours (Table 1). In a recent review of spontaneous malignant tumours in non-human primates, Kent2 reported forty-nine cases in eighteen species, but none were found in Alouatta. Houser et al.3 have found benign adrenal adenomas in Alouatta villosa of Panama.


  1. 1

    Malinow, M. R., and Maruffo, C. A., Nature, 206, 948 (1965).

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  2. 2

    Kent, S. P., Ann. N.Y. Acad. Sci., 85, 819 (1960).

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  3. 3

    Houser, R. G., Hartman, F. A., Knouff, R. A., McCoy, F. W., Anat. Rec., 142, 41 (1962).

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  4. 4

    Maruffo, C. A., and Malinow, M. R., J. Path. Bact. (in the press).

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MARUFFO, C. Spontaneous Tumours in Howler Monkeys. Nature 213, 521 (1967).

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