Is it Bison or Buffalo?

According to the NPS folks at Yellowstone, bison is the technically correct name,, but the informal name is buffalo. When you see one, what do you call it? *Feature Photo: Yellowstone National Park-NPS / Pitchengine Communities* #county10 -- *Ernie Over* Community Maven for | Twitter @@ | 307-851-0794 PitchEngine™ | *Connecting Communities* | Twitter | Facebook