Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Millions of years ...

Standing around 10 feet tall, weighing around 220 pounds and with an axe-like beak capable of delivering devastating strikes, the terror bird would have proved a ...

A handful of bite marks on a fossil tens of millions of years old speaks to an ancient tussle between two terrifying apex predators. Reading time 2 minutes Sometime between 16 and 11.6 million years ...

In Colombia, a fossil-collecting rancher has found a giant, flightless killer from 13 million years ago — and a missing link to the region’s evolutionary history. César Perdomo, a rancher and fossil ...

True to their nickname, terror birds (Phorusrhacidae) are known as one of the largest and also the most fearsome birds to ever live. These were flightless birds with ...

Add Yahoo as a preferred source to see more of our stories on Google. 12 million years ago, a fearsome predator roamed the ancient landscapes of South America. It was ...

Teeth marks seen on the leg bone of a so-called ‘terror bird’, which were predators 13 million years ago, suggest it may have been killed by an even bigger ...

Add Yahoo as a preferred source to see more of our stories on Google. The identification of part of the fossilized remains of a so-called "terror bird" species in ...

A fossil skull of the terror bird Andalgalornis is compared with the skull of a modern-day golden eagle and a human skull for scale.Ohio University / AP The term mid ...

(CNN) — Millions of years ago, long-legged, big-beaked, meat-eating “terror birds” stalked the Americas. The imposing creatures ruled the roost as top predators ...