xi's moments
Home | Innovation

Golden snub-nosed monkeys in China have wet nurses: study

Xinhua | Updated: 2019-02-22 09:08

Two golden snub-nosed monkeys look on as members of their troop fight among the treetops, deep in the Qinling Mountains of Central China. The image won top prize at this year's Wildlife Photographer of the Year Award. [Photo by Marsel Van Oosten/For China Daily]

WASHINGTON -- Chinese scientists have found that baby golden snub-nosed monkeys have "wet nurses," an activity seen for the first time in an Old World nonhuman primate.

Nearly 90 percent of golden snub-nosed monkey infants evaluated in a five-year field study were nursed by females other than their biological mothers, according to a paper published on Wednesday in the journal Science Advances.

The researchers found that 40 out of 46 infants suckled from one or more females that were not their mother, predominantly seen during their first three months.

Four of the six infants who did not receive nursing from another female died during winter, while only six of the 40 infants who were fed by "wet nurses" died, according to the study.

The study's co-author Xiang Zuofu with China's Central South University of Forestry and Technology told Xinhua that, since breastfeeding is energy-consuming, a majority of animal mothers are unwilling to do so and among primates, only prosimians and New World monkeys nurse infants that are not their children.

The cost of helping others are particularly high for monkeys such as the golden snub-nosed monkey that live in high-elevation temperate forests with extremely cold, five-month-long winters but those mutually beneficial behavior is believed to enhance infant survival and reduce postnatal reproductive costs incurred by the infant's mother, according to Xiang.

The study also showed that the allomaternal nursing activities occurred in a tolerant kin-based support network where those breast-feeding mothers are relatives.

Those collaborative activities are necessary in the early evolutionary age of human beings, so the study can provide a new perspective to human evolution study, according to Xiang.

Global Edition
BACK TO THE TOP
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349