Great Bison are very large versions of the modern bison or plains buffalo. They are pack animals, with the males defending the herd. They can be easily spooked, causing a stampede.
ST 70, DX 10, IQ 4, MA 13. Fur stops 2 hits per attack. They also attack in combat for 2-1, and 1+2 in HTH. They are 4 hex creatures.
Source: TFT:Treasure of the Silver Dragon, inthelabyrinth.org