Terror Birds appeared on Earth 20 million years ago and went "extinct" a few million years ago. They were vicious predators that could run up to 50kph.

"With a head like a pickaxe and standing two and a half meters tall, it sacrificed flight for raw power."
- Morgan Freeman, Life On Our Planet
https://life-on-our-planet.fandom.com/wiki/Phorusrhacos