The bird is a scissor-tailed flycatcher, which is the state bird of OK. (Which if you didn't recognize it or know the state bird isn't helpful, but now you know!)
I think a lot of this has to do with the fact that people associate Nebraska, a prairie state, with wide-open, flat spaces and not with rock formations. Admittedly, I got it through memories of playing Oregon Trail and having the other obvious states along the trail appear elsewhere on the quiz.
You have to wonder about the thought process that went into choosing the Oklahoma design - "Let's make an outstanding design that shows our uniqueness and things for which we are famous." "How about a bird and some flowers?" "Yeah!" "Oh, and add a mountain because everyone automatically thinks of mountains when Oklahoma is mentioned."
Got 'em all except New Jersey, because I completely forgot about New Jersey. I tried every other state in New England, then tried every state going down the eastern seaboard. Sorry, New Jersey.
ALMOST got them all (missed three). I'm Canadian but I collect coins, and I've alllllmost got all the state quarters! How about all fifty of them for another one?
For anyone who likes this quiz, there is a new quarters quiz created for the new designs that are being minted from 2010-2021. They are the America the Beautiful quarters, which one national park, forest, monument, etc is selected from each state, the five main territories (Northern Mariana Islands, Guam, US Virgin Islands, Puerto Rico, and American Samoa) as well as Washington DC for the quarter series.
I understand the very landlocked state of Arkansas doesn't have much else to brag about besides being on the Mississippi, but the water imagery was a bit confusing.
Would you prefer "Remember that time y'all ethnic cleansed the east coast? Well we're still here!"
Personally I only recognize get it b/c of the diamond... I don't know why diamonds are strongly associated with Arkansas but they are.