From a PvP standpoint the Argentavis needed a nerf in siegeing however that was not what got nerfed.

I play on a server with friends which is private. The argentavis was very unique in that it was slower than the Pterandon yet it could fly basically infinite distances but had to hover in the air to regain stamina.

Since the change, the argentavis is nothing more than a slower Pterandon with slightly increased health and damage. When I say slower btw, I do mean slower. The Argentavis only gets an increase of 2.5 points per flying stat increase where as the Pterandon gets a lot more.

Also, we can't forget that they both now have the same ability to pick things up....why couldnt we have something more unique?

A more end game bird that now feels more useless than something so easy to get such as the Pterandon....its kinda sad.