B is for Bison
I believe every October the Custard State park officials hold a "round-up" to corral all the bison in the park. The objective is to keep the heard around 1,000 bison in the Park. I have not seen the round-up but it sounds like a lot of fun. I did find this web site you might want to check out sometime. (Round Up)
On our little visit we saw about 500 or 600, with some young ones running along with the others.
South Dakota is a great place to visit. Make sure you stop by and see the bison.