Abstract
Copulatory and associated behaviors were observed during a 15 months' stay in Malaysia. Photographs revealed that the mating posture was ventro-ventral, followed by the male's approach from above and behind.
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Koyama, N. Observations on mating behavior of wild siamang gibbons at Fraser's Hill, Malaysia. Primates 12, 183–189 (1971). https://doi.org/10.1007/BF01730394
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DOI: https://doi.org/10.1007/BF01730394