Modern birds: Cassowaries, Australian birds that are slightly smaller than ostriches and are closely related to the terror bird, have quite the mean streak.Terror birds: They were the top predators on the continent of South America, before it collided with North America and jaguars and sabertooths entered the competition.They can’t hack their food, but they do pick it up and slam it against the ground. Modern birds: Seriemas have a carnivorous streak, too: In addition to plants, they eat lizards, frogs, rats, and other birds.Its presence confirms that the birds were strong enough to use their faces as a “hatchet” against other animals. And the most recent fossil includes a newly discovered bone that strengthened the connection between the skull and the beak. Terror birds: Terror birds ate anything smaller than them.So, here’s what the ancient beast might have sounded like, compared to most other birds, which sing at 1-4 kHz. Modern birds: Ostriches and emus make low-frequency noises, possibly similar to those of the terror bird.Terror birds: From the fossil’s intact inner ear, the part that sits just past the eardrum, researchers learned that the terror birds heard low frequencies-around 2,800 Hz-and therefor posit that they probably had deep vocals to match.But the world’s fastest bird title goes to the peregrine falcon, which can achieve flight speeds of more than 238 MPH while hunting. Modern birds: Ostriches could hold their own-they’re able to hit speeds of 40 MPH in short bursts.Terror birds: Would be well-matched in a race against a cheetah-terror birds were capable of speeds over 60 MPH.Seriemas can fly, but prefer to keep their feet planted firmly on the ground and use their wings primarily to woo mates. Instead, they use their wings to balance while running. Modern birds: Ostriches don’t fly either.Terror birds: Couldn’t fly, but they were plenty menacing on the ground.The ancient bird’s closest relative is the seriema, a long-legged South American bird that measure in at just 3 feet. Modern birds: Ostriches and terror birds would be well matched in a basketball game- ostriches top 9 feet (they’re the tallest birds alive today).The newly discovered fossil is a more recent species, Llallawavis scagliai, and stands at a comparatively modest 4 feet.
Terror birds: The largest species was 10 feet tall and weighed more than 1,000 pounds.Here’s how modern birds stack up against their long-dead relative. Exactly why these birds-faster and more fearsome than any of their modern relatives-went extinct 2.5 million years ago remains a mystery. The fossil also offers new insight into the formidable creature’s vocalizations: The preserved middle ear suggests that they were great at hearing low frequencies, and therefore probably communicated with a low bellowing sound. The new find suggests these birds had the ability to inflict some serious pain on their prey. The discovery of a new fossil of the aptly-named “terror bird” provides the most complete look at the feathered predator to date. Rex-ruled over what is now South America. Sixty million years ago, just after the dinosaurs died out, giant birds with weaponous beaks-and heads that vaguely resemble a T.
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