If you are an explorer, and you want to go on the sky, you can tame an eagle. They can fix your suits, swords and more equipments in his saddle. Think about it, it is a flying workshop. Also strong, fast, can lift a thylacoleo or ankylo and has really cool looking. Any tiger in redwoods, can't attack you, you can beat it. Everywhere you go, is a new world for you with your eagle.
Getting a massive TLC update in March 2018. The saddle will act as a mobile smithy, Argentavis will be able to carry with Talons as well as with its beak, reduced carry weight on obsidian and a few other unannounced resources (similar to the mammoth and wood), and will also gain a Rapid HP Regen upon eating (likely from devouring corpses and not specifically food from inventory). Like so people can see!