(1) Cambridge University, UK;(2) Oxford University, UK;(3) Present address: 5, Highcroft Avenue, DY8 5LX Stourbridge, West Midlands, United Kingdom;(4) Present address: Department of Materials, Parks Road, OX1 3PH Oxford, United Kingdom
Abstract:
Homosexual mounting in apes and prosimians is rare. Male-male mounting was observed between an adult male white-handed gibbon and an adolescent male in the same group. The behaviour is discussed in terms of the gibbon group's social structure and the development of the adolescent. It is suggested that this behaviour provides reassurance for the adolescent gibbon.