Terror Bird evolution

[Seijun]

How much is know about the evolution of "terror birds"? I.e, what did they evolve from? Flighted birds or flightless? Do they have any particularly close modern-day relatives? Perhaps a bird that might have even evolved from a terror bird?

[paleoferroequine]

How much is know about the evolution of "terror birds"? I.e, what did they evolve from? Flighted birds or flightless? Do they have any particularly close modern-day relatives? Perhaps a bird that might have even evolved from a terror bird?

Here's Darren Naish's old blog about them:
http://darrennaish.blogspot.com/2006/10/terror-birds.html
Also Google Phorusrhacids PDF. You tend to get better results putting in PDF.   Modern relatives include hoatzins and seriemas. Earliest known ancestors might have been late Cretaceous and might have been like big seriemas, flighted but mainly cursorial.

[Jetoar]

Thanks for share friend, It is a good article of evolution of Phorusrhacids  .

[Dinoguy2]

How much is know about the evolution of "terror birds"? I.e, what did they evolve from? Flighted birds or flightless? Do they have any particularly close modern-day relatives? Perhaps a bird that might have even evolved from a terror bird?

Here's Darren Naish's old blog about them:
http://darrennaish.blogspot.com/2006/10/terror-birds.html
Also Google Phorusrhacids PDF. You tend to get better results putting in PDF.   Modern relatives include hoatzins and seriemas. Earliest known ancestors might have been late Cretaceous and might have been like big seriemas, flighted but mainly cursorial.

Yup, in fact there is an undescribed partial skeleton of a seriama-like bird from Cretacous Antarctica that apparently shares some features with terror birds, and may be one of their ancestors that survived the K-Pg extinction.

[Iguanocolossus]

Strigogyps MIGHT be their oldest ancestor, but there's some debate on it. Cariamiformes are first seen in Maastrichtian Antarctica