Absolute unit that nearly got wiped out and then ended up on the back of a nickel.
Fun fact: Yellowstone's entire herd — the only wild, genetically pure bison in America — descends from just 23 animals.
You pay monthly to let someone in pyjamas strangle you, and then you thank them for it.
Fun fact: "Hélio Gracie developed it because he was too physically frail for judo's explosive throws."