The Buffalo Bills mascot is a 7-foot-2-inch tall blue bison who joined the team in 2000. As legend has it, Billy was roaming the wide-open plains out west like his bison brethren when he felt drawn ...

Here is more on what a Buffalo Bill actually is and the origin of the name. The logo and mascot may indicate that a Buffalo Bill is a bison, but that's not where the nickname of the team stems from.