I found a photo by Nekomama7 (zoochat member, but is not active) in flickr saying that one of the females is pregnant and can give birth any day now. I'm not sure how accurate this person is, but I'm hoping that it is true!
It's been four weeks since that post and I have not seen anything or heard anything around the zoo, which leads me to believe that it was a mistake or they are not born yet.
