Becoming altricial/bipedal

Gerrell Drawhorn (
16 Oct 1995 03:28:51 GMT

Just a thought on this string...don't gibbon and siamang infants
successfully grasp onto their mothers? These mothers are almost always in
an orthograde (erect) posture. One would think that this would be true of
infant gibbons whose mothers have come to the ground and locomote
bipedally for short distances. Maybe I am missing something here?
Also, there is evidence that the dental maturation of Australopithecines
was also apelike and that there is a high correlation between dental
maturation and such life history events like weaning age.
Jerry Drawhorn
Dept. of Anthropology
UC Davis