Feat for a Baboon Companion?

[Zombulian]

They're not on the usual Animal Companion list, but I swear there's a feat out there that lets a specific race (I think Elves?) have a Baboon AC with advanced progression. I can't find it anywhere. Anyone know what I'm talking about?

[Remuko]

I think Aerenal Beastmaster in races of ebberon is what youre looking for.

[Zombulian]

I think Aerenal Beastmaster in races of ebberon is what youre looking for.

That is exactly what I was looking for haha. I found it a few minutes later.
Thanks!