Mating behaviors of the proboscis monkey (Nasalis larvatus)
Article first published online: 17 JUL 2006
© 2006 Wiley-Liss, Inc.
American Journal of Primatology
Volume 68, Issue 8, pages 832–837, August 2006
How to Cite
Murai, T. (2006), Mating behaviors of the proboscis monkey (Nasalis larvatus). Am. J. Primatol., 68: 832–837. doi: 10.1002/ajp.20266
- Issue published online: 17 JUL 2006
- Article first published online: 17 JUL 2006
- Manuscript Accepted: 24 OCT 2005
- Manuscript Revised: 11 OCT 2005
- Manuscript Received: 7 SEP 2003
- mating behavior;
- sexual swelling;
The mating behaviors of the proboscis monkey were observed in a riverine forest along a tributary of the Kinabatangan River, Sabah, Malaysia, for a period of 30 months. Solicitation for copulation was initiated frequently by males and occasionally by females. Most copulations involved only one mount; however, some multiple-mount copulations were observed and a maximum of six mounts per copulation were recorded. The mean duration of mounts was about 27 sec. Nonsexual mounts (female–female, female–juvenile/infant, juvenile–juvenile, and juvenile–infant) were also observed. Female–female mounts occurred shortly after failed solicitations toward males were observed. Harassment by juveniles and/or infants was observed during copulation; however, these harassments apparently did not interfere with copulation. Sexual swelling was evident in 77.4% of copulating females, with copulating subadult females showing the most distinct swelling. Am. J. Primatol. 68:832–837, 2006. © 2006 Wiley-Liss, Inc.