Africa's elephants 'could die out'

More elephants in Africa are being killed each year than are being born, according to a study.

Researchers believe that since 2010 an average of nearly 35,000 elephants have been killed in Africa every year.

Elephants are . They contain a material called ivory which is used to make ornaments in parts of Asia.

The researchers warn that if this continues to happen, the animals could be wiped out in 100 years.

The report is published in the Proceedings of the National Academy of Sciences.

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