During a 10-year span, a team of primatologists witnessed 15 daytime births in wild gelada monkeys residing in the grasslands of high-altitude Ethiopia. It's unusual to witness daytime births. Most ...

According to a new study, chimpanzees, like humans, must contend with a confined bony birth canal when giving birth. In humans, the problem is exacerbated by our unique form of upright walking, since ...

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 ...