How did the estimated mass of *Gastornis* compare to the modern ostrich?

Answer

It far exceeded modern running birds (like the ostrich) in sheer bulk.

While the ostrich retains the height record among modern terrestrial birds, *Gastornis* far exceeded modern running birds in sheer bulk, with estimates placing its weight between 200 to over 300 kilograms.

How did the estimated mass of *Gastornis* compare to the modern ostrich?
fossilCenozoicbirdpaleontologyextinct