Um... no... superficial visual similarities do not make things identical. The phrase "terror birds" refers specifically to any Phorusrhacids of the Order Cariamiformes, which are most closely related to falcons and parrots. Gastornis is one of the much earlier Gastornithiformes, which despite looking similar, are not closely related to Phorusrhacids or Cariamiformes, but are instead Anseriformes... ducks and geese... which are not considered terror birds.Gastornis looks like this. It clearly shows it is a Terror Bird.
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