I haven't read all of the replies. But here's my two cents anyhow....
I would love to see pronghorn in the game; However, they wouldn't fit in any of the current reserves in my opinion.
I plan on posting this in Environment Suggestions later on, but I've been saying since the beginning that a reserve based on Arizona would be a fantastic addition to the game. Granted, I'm prejudiced... I've lived in Arizona all my life. But, most people that have been here and seen the wildlife can agree that we have some INCREDIBLE wildlife. We have mule deer, rocky mountain elk (the big kind... not them puny roosevelts
), coyotes, foxes, bobcats, small game (quail, dove, rabbit....), mountain lion, bison (in some areas), bighorn, pronghorn, bear.... It goes on and on. And the diversity of the area is incredible. You can go from harsh, barren scrubbrush desert, to lush green pine forests in half an hour here. The only difficulty would be deciding which animals to put in... cause oh boy are there a LOT!
Anywho, I realize that was kinda off-topic, but that's a way pronghorn would fit in, along with many others.
Also, while pronghorn are *mainly* plains animals, I've personally seen herds feeding up high in Juniper forests. Pretty weird to see, honestly, but cool nonetheless! (not trying to argue, just stating a cool fact!