The troubles with Patsy have come to a head. Patsy is refusing to come in at night and she's not letting any of the other elephants come in either. Barb Luciano, the young elephant keeper, has to solve the problem. Zoo vet, Dr. Graham Crawshaw, has been called to look at Charles the silverback gorilla. He will have to decide whether to operate on the great gorilla's tooth. He also must determine whether it is safe to put anesthetize Charles -- considering his weight and age. Today Karen Hamilton is taking the next step with Wambli, the bald eagle. Karen is weighing her -- and this requires a lot of delicate handling. It is the next step in building trust between the keeper and the animal.