I found the following article from the BBC, about this guy -
It had been thought the fearsome beasts became extinct as little as 10,000 years ago - a time when humans shared their North American habitat.
But a US team has now revised this date to about two million years earlier.
The study, published in Geology, also sheds light on the flightless birds' migration to North America.
T. walleri is thought to be the largest species of the terror bird family. It would have stood 2m (7ft) tall and weighed 150kg (330lb).
The flightless species, which inhabited South and North America, had an enormous beak and lived up to its terror tag by being a top predator of its time.