"Of the Beast Tribes, the Aarakocra are at least the more amiable folk to meet, though that's a rather low bar, and definitely not universal. They are content to live in high mountain peaks, descending only to exchange important goings-on in the world. They are well-known for their pride, such that if one were to aid an Aarakocra in a time of need, they will never forget to repay that debt. However, this individual exchange is their extent of forming alliances. The existence of a "nation" is foreign to them, especially since they often have several nesting grounds, migrating according to the changing seasons. Some of the less friendly tribes are known to engage in banditry, but they rarely go too far from their nests."
-Excerpt from Volo's Guide to Ozelan Beasts