Scientists from the University of St. Andrews and the Max Planck Institute of Animal Behavior have published new findings in Science that underscore the importance of maternal teaching for orangutan youngsters in Sumatra. Over a 12‑year field study at the Suaq Balimbing monitoring station, researchers recorded nearly 7,000 observations of 21 immature orangutans from birth until they reached independence at about 8.5 years of age.

Learning from mothers boosts diet breadth

The team distinguished two learning styles: social learning, when infants closely watched their mothers’ foraging habits, and individual learning, when they explored the forest on their own. By tracking the time between a baby’s attentive peering and its subsequent independent exploration, the researchers found an average lag of 2.5 hours. This ripple effect means that juveniles acquire five to six times more knowledge from social learning than from solitary discovery.

Infants that combined high rates of both social and individual learning developed the broadest dietary profiles, mastering up to 250 different food items, some of which require simple tool use. Those with low levels of both learning types showed a threefold reduction in diet breadth, indicating a clear link between learning style and future survival.

Why maternal guidance matters

“Learning purely through individual exploration can be risky for a naive orangutan,” said study senior author Caroline Schuppli. “Watching and learning from knowledgeable role models, such as their mothers, offers a safer path to acquiring essential skills.” The researchers noted that the prolonged influence of a single peering event suggests that maternal teaching has a lasting impact on a juvenile’s foraging success.

Revathe Thillaikumar, a postdoctoral fellow at MPI‑AB, added that the study bridges a long‑standing gap between observed learning events and measurable outcomes like diet. “Analyzing each individual on its own was a linchpin for our study because it allowed us to finally link learning and skill development,” Thillaikumar explained.

Implications for conservation

Understanding the depth of cultural transmission in orangutans highlights the species’ reliance on stable, long‑term family bonds. Conservation programs that protect mother‑infant groups and preserve the forest habitats where this learning occurs may be more effective than strategies focused solely on adult populations.

Andrew Whiten of St. Andrews noted that the findings suggest a deep evolutionary root for the complex cultural learning seen in humans. “The pattern we see in orangutans likely dates back to our common ancestors millions of years ago,” he said.

These insights reinforce the value of long‑term field research, which provides a window into how culture and survival intertwine over evolutionary time. As orangutan populations continue to face habitat loss, preserving the conditions that enable maternal teaching could be key to ensuring the species’ future.

Original reporting: KTBS 3 (Shreveport) — read the source article.