Learn English: Terror Bird's Deadly Secret: A Prehistoric Showdown (normal)

A 13-million-year-old terror bird fossil reveals a surprising predator-prey interaction from the past.

Intriguing bite marks on its leg bone suggest a fight with a massive caiman, a crocodile-like reptile.

Using 3D technology, scientists matched the teeth marks to the extinct caiman species Purussaurus neivensis.

This discovery challenges our understanding of the terror bird as an invincible apex predator.