10 Terrifying Prehistoric Animals — That Weren’t Dinosaurs

Published February 19, 2015
Updated November 7, 2023

Phorusrhacidae

Terror Birds

Reconstruction of a terror bird.

Their scientific name is neither particularly intimidating nor easy to remember, so let’s just refer to these large, flightless, carnivorous birds by their colloquial name: terror birds.

They grew to between three and 10 feet long, stood up to 10 feet tall, could run at speeds of 30 miles per hour, and had a giant, curved beak, like an eagle’s. The only living relative of the terror bird is the seriema, a 35-inch bird that’s about as threatening as a butterfly.

Nevertheless, don’t underestimate the terror bird, a top predator for almost 60 million years.

Next up: A sloth the size of an elephant…

author
John Kuroski
author
John Kuroski is the editorial director of All That's Interesting. He graduated from New York University with a degree in history, earning a place in the Phi Alpha Theta honor society for history students. An editor at All That's Interesting since 2015, his areas of interest include modern history and true crime.
editor
Savannah Cox
editor
Savannah Cox holds a Master's in International Affairs from The New School as well as a PhD from the University of California, Berkeley, and now serves as an Assistant Professor at the University of Sheffield. Her work as a writer has also appeared on DNAinfo.
Cite This Article
Kuroski, John. "10 Terrifying Prehistoric Animals — That Weren’t Dinosaurs." AllThatsInteresting.com, February 19, 2015, https://allthatsinteresting.com/terrifying-prehistoric-creatures. Accessed April 18, 2024.