Does Columbus have a nursery or maternity yard? In Toronto our hand reared cubs Hudson and Humphrey had a much smaller yard with a shallow pool where they could play and learn until they were big enough for the main yards. Worked well because that enabled the adults to stay on exhibit easily.
To the right of the entrance, the very first animal attraction closest to it in fact, there is an indoor, nursery like exhibit that guests can view into. I believe on my last two visits they featured fennec fox kits (same foxes). From the way I see it, and someone correct me I'm wrong but it is typically used as a "Temporary Featured Animal Station" rather than a nursery.