From Creatures Wikia
In the Curiosity Norns, they have a new drive - curiosity. Curiosity is increased by being inactive, staying at home, or looking at objects, and decreased by experimenting with objects. Boredom is reduced by being physically active.
The Curiosity Norns cannot tell you that they're feeling curious - when norns are feeling more curious than any of their other drives, Ettina advises that norns will express for their next highest drive - but say that they're feeling it more strongly than they ought to.
They are available at Ettina's Labs.