@TinoPup It was right beside the glass wall on the middle level of the main building, in between the City of Science exhibit and the snack area. There was another exhibit right next to it for domestic rats. I marked the location in red on the museum map below:
@ZooElephantsMan Dang! I didn't go over that far, too many kids and I couldn't see any animals when glancing. I would have liked to see the rats, especially Thank you for including the map, that's super helpful.