Why did the argentavis go extinct?

Answer 1

Since we don't even know if Amargasaurus is even extinct at all, it's hard to say, so far theres only speculation. Some say it is extinct and some say it never went extinct and might exist today.

Answer 2

Argentavis was the largest flying bird in recorded history. It is not known exactly why they went extinct but it is most likely that they could not adapt to changes in the climate.