Despite, only this year they will finally make the bald eagle the national bird. Which, I also learned that they are not official symbols until a President signs a document for them to be. It is just a recognized symbol but not official. (Just my opinion but why do they really need a bill for this? What changes would making anything like this official really do?)
Here is a list of other US symbols (article includes links to other countries of the world national symbols, some official, some not made official) if you are interested:
European bison were called bison a thousand years before America was discovered by Europeans and is a very close relative (different species). Buffalo is the name of the African animal that is only distantly related (different genus) and has been called bufalus by Europeans since before America was discovered by those same Europeans.
If you are going to die on a hill, might as well call them by the names given to them by people who lived with them for thousands of years before Europeans came here:
in Arapaho: bii (bison cow), henéécee (bison bull)
in Lakota: pté (bison cow), tȟatȟáŋka (bison bull) - we all know how to pronounce that one, thanks to Dances with Wolves.