The Museum is housed in a beautiful Beaux-arts building with intricate carvings on the outside that supposedly represent "all the vertebrate classes" as well as "geographic and economic themes". I dunno about that, but we had a fun time figuring out the various critters (the fact that they're high up and my vision isn't the best made this more of a challenge than it would be for most).
The Museum is clearly based on various collections typical of the late Victorian era into the early 1900's, as well as dioramas that perhaps don't go that far back. The American Indian displays seem more modern to me, but tucked here and there throughout the museum are more modern displays, such as one in the Bird Hall where you can listen to bird calls and identify (or misidentify) them.
I tend to get bored with just static displays, while after a bit hubby and eldest tend to be more interested in how they achieve the effect ("Look, levitating fish! Stand here, you can juuuust barely see the string; I think they painted it"), but the museum is small enough we enjoyed all of it (the Hall of Mammals was not open, however).
The campus is beautiful and the price is right -- free! There's also a small gift shop with some fun stuff. Give it a try, and if it isn't worth your time, there's always the shops across the street. Prairie Lights bookstore is just a block away. ;)
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC