To which specific bird family did the terror birds formally belong?

Answer

Phorusrhacidae

The text specifies that these creatures formally belonged to the family Phorusrhacidae and were not closely related to ostriches or emus.

To which specific bird family did the terror birds formally belong?

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What Happened to the Prehistoric "Terror Bird"? | Nature Bites

birdanimalextinctioncausePrehistoric