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The animal ‘Gigantopithecus' lived 200,000 years ago.
It was like a big monkey.
But what made it die.
A new study has the answer.
Gigantopithecus was three metres tall.
It was 300 kilograms.
It lived in forests in Asia.
In the 1930s, a scientist found a big tooth.
It was four times the size of a monkey's tooth.
Scientists found about 2,000 more teeth.
They were from the same animal.
But they still had questions.
Professor Zhang Yingqi's a dinosaur expert.
He worked on the study.
The team studied the environment for Gigantopithecus.
They studied before and after its time too.
The climate changed.
But Gigantopithecus couldn't travel far to get different food.
It was too big.
It had to start eating unhealthy food.
That's why it died, says Professor Zhang.
Gigantopithecus' story is important today because of climate change.