TIL That the bison is the "National Mammal" of the US and Obama signed it. And I don't even remember this happening or making news.

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:

https://en.m.wikipedia.org/wiki/National_symbols_of_the_United_States