Menu

Orangutans Nurse Their Young for More than Eight Years

Scientists think these apes switch to breastfeeding during periods of food scarcity.

May 19, 2017
Diana Kwon

FLICKR, CHEM7

Orangutans nurse their young for up to eight years, longer than any other mammal, according to a study published this week (May 17) in Science Advances.

To determine how long orangutans nursed their young, scientists assessed levels of barium, a trace element that is absorbed through maternal milk into offsprings’ teeth and bones. “This paper represents an exciting new method of determining weaning age from the teeth of wild primates,” Cheryl Knott, a biological anthropologist and director of the Gunung Palang Orangutan Project in Indonesia who was not involved in the study, told National Geographic.

Smith and colleagues analyzed nine teeth from four museum samples of young animals, two Bornean organutans (Pongo pygmaeus) and two Sumatran orangutans (P. abelii), and found that barium levels increased during the first year of life and started to decline when the animals were between 12 and 18 months old. However, barium levels continued to fluctuate for around eight years, which, the authors suggest, is a pattern that relates to cycles of milk consumption.

The team also found an association between high barium levels and periods when food was scarce. “When times are tough, adult orangutans will fall back on things like bark or hard seeds,” study coauthor Tanya Smith, an associate professor in the Australian Research Center for Human Evolution at Griffith University, told The New York Times. “But offspring may not have the ability to eat some of these foods, or the knowledge to find them on their own, so they’re maybe falling back on mothers’ milk during periods of scarcity.”

November 2018

Intelligent Science

Wrapping our heads around human smarts

Marketplace

Sponsored Product Updates

LGC announces new, integrated, global portfolio brand, Biosearch Technologies, representing genomic tools for mission critical customer applications

LGC announces new, integrated, global portfolio brand, Biosearch Technologies, representing genomic tools for mission critical customer applications

LGC’s Genomics division announced it is transforming its branding under LGC, Biosearch Technologies, a unified portfolio brand integrating optimised genomic analysis technologies and tools to accelerate scientific outcomes.

DefiniGEN licenses CRISPR-Cas9 gene editing technology from Broad Institute to develop cell models for optimized metabolic disease drug development

DefiniGEN licenses CRISPR-Cas9 gene editing technology from Broad Institute to develop cell models for optimized metabolic disease drug development

DefiniGEN Ltd are pleased to announce the commercial licensing of CRISPR-Cas9 gene-editing technology from Broad Institute of MIT and Harvard in the USA, to develop human cell disease models to support preclinical metabolic disease therapeutic programmes.

Thermo Fisher Scientific: Freezers for Biological Samples

Thermo Fisher Scientific: Freezers for Biological Samples

Fluctuations in temperature can reduce the efficacy, decompose, or shorten the shelf life of biologics. Therefore, it is important to store biologics at the right temperature using standardized protocols.