In a study on this behavior published in the journal Primates, researchers call such intervention through childbirth a "rare phenomenon," adding that it is "generally believed to be a behavior unique to our species."
Similar behavior in nonhuman primates had previously been seen only once before, among a group of black and white snub-nosed monkeys in 2013. That instance, however, was not photographed or well-documented, the BBC reports.
While origin of this behavior is still a source of speculation, primatologist Dr. Carol M. Berman, unaffiliated with the study, told The Dodo that primates typically require no intervention during labor and that this might be just an isolated incident. Unlike humans, whose pelvises are much smaller in relation to the size of newborns, langurs and other animals face fewer complications from the birthing process.