The veterinarians felt that the loss of her litter had caused the tigress to fall into a depression. The doctors decided that if the tigress could surrogate another mother's cubs, perhaps she would improve. After checking with many other zoos across the country, the depressing news was that there were no tiger cubs of the right age to introduce to the mourning mother..
Bridled Nail-tail Wallaby (Onychogalea fraenata) and there are only around 500 individuals left in the entire world. The small wallaby is named for its three distinguishing characteristics; a white "bridle" line that runs down from the back of the neck around the shoulders, and the horny spur on the end of its tail.