The Amur tiger cubs have been confirmed as female and temporarily dubbed Big and Small as one is significantly undersized. The small cub is struggling. She is not putting on weight at anywhere near the weight of her sister. Her temperature had dropped, her glucose levels dropped, and her white blood cell count was up forcing the staff to consider pulling her. They left her with mom overnight after a round of antibiotics. She survived the night and seemed better. Further testing as shown an enlarged heart, her lungs are not clear, and a lesion on her liver. They believe she may have a congenital heart defect. She is responding to antibiotics, is warm, feeding and active but she isn't really growing. The zoo has called in a Veterinary Cardiologist to take a look at her in the coming days to get a better idea of what her future holds and how best to assist her. Mazy is still doing a fantastic job with both cubs. Really have to wonder if this could have played a factor in her brother's death. Also might be why they are catching her issues so early on. They know what they should be looking for. Hope both girls make it. The tiger keepers and vet staff have had enough sorrow losing one cub they fought hard for, they deserve a victory here.