@article {309831,
	title = {Familial incidence of multiple births in a colony of chimpanzees (Pan troglodytes).},
	journal = {J Med Primatol},
	volume = {19},
	year = {1990},
	month = {1990},
	pages = {467-78},
	abstract = {<p>This paper describes the incidence of multiple births in the Yerkes Chimpanzee colony for a period of about 63 years. Pedigrees are presented for all multiple births. They demonstrate the recurrence of twins in relatively few family lines which can be traced back to a small number of ancestors. The findings suggest that twinning is a family trait in chimpanzees and they support the hypothesis that the incidence of multiple births is genetically influenced in this colony. In addition, a relatively high level of inbreeding may have enhanced the incidence of multiple births in these family lines. Similar findings are known from human populations.</p>
},
	keywords = {Animals, Female, Inbreeding, Male, Pan troglodytes, Pedigree, Pregnancy, Pregnancy, Multiple, Twins},
	issn = {0047-2565},
	author = {Geissmann, T}
}
