International Journal of Primatology

, Volume 28, Issue 5, pp 1075–1083

Reproductive Strategies of Trachypithecus pileatus in Arunachal Pradesh, India


DOI: 10.1007/s10764-007-9204-y

Cite this article as:
Solanki, G.S., Kumar, A. & Sharma, B.K. Int J Primatol (2007) 28: 1075. doi:10.1007/s10764-007-9204-y


We studied reproductive behavior of free-ranging capped langurs (Trachypithecus pileatus) in the Pakhui Wildlife Sanctuary, Arunachal Pradesh, India. Four species of primates —Trachypithecus pileatus, Macaca mulatta, M. assamensis, and Nycticebus bengalensis— live there. We studied the mating seasons, mating frequency, copulatory attempts, time spent in copulation, and interval between 2 successive copulations, gestation length, and interbirth interval of 4 groups of capped langurs during 2001–2003. We observed 2 mating seasons in a year. The first was larger, comprising 5 months (September–January), and the second was short, April and May. Mating was intensive in the morning session (0600–1000 h); 57% of total mating events occurred then. The average gestation period was 200 d. November was the most favorable month for breeding. In a year, 107 mating events occurred involving 5 adult females. Average time per mounting attempt is 12 s. Duration of mounting was the maximum in November. Interbirth interval was 23 months and 10 d. The birth season was 129 days, December–April; 53% of births occurred in February and March. Average birth rate is 0.386 birth/female/yr.


birth intervalbreeding seasongestation lengthmating behaviorreproductionTrachypithecus pileatus

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of ForestryNorth Eastern Regional Institute of Science and TechnologyItanagarIndia
  2. 2.Department of ZoologyNorth Eastern Hill UniversityShillong—India