https://cerld.com/thunder-testosterone/

why the terror, Well, these crows on steroids were up to ten feet tall and could gallop after you at velocities up to some 37 miles per hour. Relatives of these monsters with equally large beaks and talons have been found in Texas and Florida, and presumable bridged the geographical gap in-between. So, should the natives have been afraid; very afraid, Well, in this case the top apex predators probably succumbed to being ultimately human prey since the terror birds, along with the rest of the North, Central and South American mega-fauna went extinct in pretty quick smart fashion after humans appeared on the scene.

https://cerld.com/thunder-testosterone/