With remains of that family of birds now found in Europe and Algeria, it's actually discussed that this kind of bird could have survived longer than that, as it has so many clear parallels with the Roc. On the other hand, the mainstream theory about the Roc goes more about travelers from Eurasia meeting ostriches, and not having seen flightless birds before, mistake the ostriches as the chicks of some gargantuan bird of prey.
Both those cases are not yet fully accepted as true phorusrhacid. It could be a possibility though.
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