Nearly 20 years ago, while repairing a fence on his ranch in Colombia, fossil collector César Perdomo found the middle leg bone of a bird. The 12-million-year-old fossil, known as a tibiotarsus ...

A fossil fragment indicates that the ancient predator was 20% more massive.

In the vast plains of ancient South America, millions of years ago, a menacing shadow loomed over the grasslands. It wasn’t a dinosaur or a mammalian predator, but a colossal bird that dominated the ...

Aristos is a Newsweek science and health reporter with the London, U.K., bureau. He is particularly focused on archaeology and paleontology, although he has covered a wide variety of topics ...

The timeframe precedes the peak period of the Phorusrhacidae, the official name given to 17 species of birds characterized by dagger-like beaks. Can experts classify the predatory bird of Antarctica ...

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.

The 12-million-year-old fossil, known as a tibiotarsus, belonged to a now-extinct creature in the Phorusrhacidae family, which was made up of mostly flightless, giant, meat-eating birds known ...

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