One of the critically endangered gorillas in the New Orleans’ zoo is expecting her first baby, and already is being trained with a “doll” to hold her future offspring.Thirteen-year-old Tumani’s training “doll” doesn’t look anything like a gorilla because a stuffed toy could easily be torn apart, the Audubon Zoo’s chief veterinarian, Dr. Robert McLean, said Monday. Instead, a rugged section of canvas firehose tubing