Buffalo calls himself a buffalo wearing an elephant suit but he actually is a bison. His, quest, Buffalo's Identity Crisis invovles talking to Dave, then Pokey, in the main room 15.
Buffalo is in room 23.
1."Helloaphant! I'm not really an elephant but a buffalo wearing an elephant suit. Could you tell! A master of disguise. Anyway, could you find my brother Dave? He's hiding out somewhere fairly close to here."
2."Ha! Everyone doubted I was really a buffalo. Wait... I'm a bison! Right. A bison, not to be confused. Thanks for relaying that message to Dave."