Buffalo

Right. Okay. So I'm sure Lauren Faust meant well when she came up with the concept, but, well.

Buffalo in Friendship is Magic live near the pony town of Appaloosa, as they have been doing for many generations. They live in herds, have a strong sense of tradition and home, and love to stampede. After the arrival of the Appaloosans on their land, they had to learn to share with their colonisers. Thank you Lauren. Some Buffalo wear feather headbands, while some like Chief Thunderhooves wear full headdresses and others wear nothing.

Tails of Equestria, the first G4 TTRPG game, says that only some buffalo have accepted the compromise, while others still want the ponies to leave. It's something, I suppose. ToE also says they live north of the Macintosh Hills, are nomadic and have incredibly thick hides.