Learn English: The Mystery of the Baobab Tree (normal)

The baobab tree, a symbol of Madagascar, has a mysterious past that has puzzled scientists for years.

It was believed that giant tortoises and lemurs helped the baobab tree spread its seeds, but they went extinct centuries ago.

This should have led to the baobab's extinction, but it has somehow survived.

Researchers think that the arrival of bush pigs, introduced from mainland Africa, may be the reason for the baobab's continued existence.