Skip to content

Solving a Primate Puzzle

Scientists finally think they know why a giant primate went extinct over 200,000 years ago.
Side view of a large primate walking on all fours with a white background.
Concavenator (CC BY-SA 4.0)
Why did this giant ape go extinct?

A primate nearly twice the size of a gorilla once lived in the forests of southern Asia. But a little over 200,000 years ago, it went extinct. A group of researchers say they think they know why.

Scientists first identified the primate, called Gigantopithecus blacki or G. blacki, about 100 years ago based on the existence of huge teeth that didn’t match the teeth of existing primates. But they didn’t know why G. blacki no longer existed. What caused it to die out?

To answer that question, researchers collected some fossilized teeth and used a technique called luminescence dating to determine their age. The oldest teeth were more than two million years old, while the most recent were about 250,000 years old. Scientists estimated that G. blacki went extinct between 215,000 and 295,000 years ago.

Next, it was time to look at what happened toward the end of the primate’s existence. Scientists know that the climate changed around 600,000 or 700,000 years ago. The lush forests where G. blacki lived began to thin out. The fruit trees where it found most of its food were not as plentiful. Unlike other apes, G. blacki was too large to climb the trees and get the fruit that grew higher up. So, what did it eat? Scientists looked at the most recent G. blacki teeth and found scratches on them, suggesting that the huge primates started to eat less nutritious bark and twigs. Researchers say this is why G. blacki became extinct. It just couldn’t survive the changing environment.

Face Thinking Icon

Fun Fact!

© Josh/

What does Gigantopithecus blacki have in common with orangutans like the one in this video?

Despite its size, G. blacki is more closely related to orangutans than to larger apes like gorillas!

How Big Was This Beast?

Lineup of a human, an ostrich, Gigantopithecus, a white rhino, a giraffe, an African elephant and a gorilla with their heights and weights.
© Sabri Deniz Kizil/; Infographic Encyclopædia Britannica, Inc.

How large was Gigantopithecus blacki compared to some modern land animals?

What Makes an Ape an Ape?

A baby gorilla sleeps in the arms of an adult gorilla.
© Dalriada50—iStock/Getty Images
That’s one adorable ape! What’s the difference between an ape and a monkey? Learn this and more at Britannica!
Word of the Day Icon

Word of the Day


Part of speech:
: a change in a plant or an animal that makes it better able to live in a particular place or situation
Definitions provided by
Merriam-Webster Logo
Game Icon


Word Search

Primates are hidden all over this puzzle. Can you find them?


In Case You Missed It

Brazil’s National Museum has received a generous gift of more than 1,100 fossils.
June 6, 2024
A new book about life in ancient Egypt is based on a very old story.
June 2, 2024
A miniature poodle named Sage won top prize at the Westminster Dog Show.
May 30, 2024
The finalists for the 2024 Comedy Pet Photography Awards have been announced!
May 22, 2024