Everyone is correct - it is the schools that are wrong:
Contrary to the song “Home on the Range,” buffalo do not roam in the American West. Instead, they are indigenous to South Asia (water buffalo) and Africa (Cape buffalo), while bison are found in North America and parts of Europe. ... Bison are the hipsters of the two animals, sporting thick beards. Buffalo are beardless.
aggy of the west has an excuse - they are aggy after all; CU is supposed to be better than that.