Complicated births may not have arisen in humans as a trade-off between our need for big brains and pelvises suitable for upright walking, new research in chimps suggests. When you purchase through ...

3D simulation of the birth canal of chimpanzees with (B) the fetal head in a fully extended position, the typical head alignment in apes, and (C) the fetal head in a fully flexed position, the usual ...

Difficult births are not unique to humans, a new analysis of chimpanzee pelvic bones has revealed. The findings suggest that complicated births may not have arisen in humans as a trade-off between our ...