ANT331H5 Lecture Notes - Lecture 4: Weaning, Sexual Coercion, Africa One
Document Summary
Strepsirrhines: exhibit a large range of mating systems, olfaction important. Flexibility in mating behavior: male dominance rank, social context, diurnal. Se asia: gibbon & siamangs, territorial family groups, monogamy, monomorphism, low rates of copulation, males small testicles. Sumatra & borneo: dispersed polygyny, greatest sexual dimorphism of body size of all primates. Females give birth after every 8 years - largest birth interval. Orangutan males: 2 stages of development, younger sexually mature males. Lack dominant male traits: older dominant males. Large body size: relatively small testicles - b/c less male-male competition. Gorillas: africa, one male polygyny, males small testicles, extreme sexual dimorphism in body size. Chimpanzees and bonobos (pygmy chimpanzees: probably shared common ancestor 6 mya, bonobos only found south of congo river. Chimpanzees: multi male/multi female promiscuity, males prefer older experienced females. Signals: elongated nipples - demonstrates successful pregnancy and weaning, existing offspring.
