@thedinosaurhunter
@concavenanimator

Sprinting in next is a giant in their own right, and a terror among both avian and mammal.

Phorusrhacos.

Phorusrhacos was an extinct genus of terror bird known to inhabit woodlands and grasslands in Milocene Patagonia. Over 8ft tall and nearly 300lbs, this bird was one of the largest that ever lived and a top dog where it reigned, using its 2ft long hooked beak and sharp talons to chase down and take down prey.

And as this Guest User is sure to find out, it was an apex runner.