TACOMA, Wash. (AP) - Officials at a Tacoma, Wash., zoo say a Sumatran tiger named Jaya has given birth to a cub - a surprise since zoo staffers didn't know the big cat was pregnant. They say both mom and cub seem healthy. Point Defiance & Aquarium officials say several ultrasounds had been performed on the tiger in the past few weeks but it's not easy to get clear images on a standing, moving tiger. Nothing about Jaya's behavior suggested she was about to give birth. The News Tribune reports that veterinarians found the cub in a nest box when they were getting Jaya ready for a physical Wednesday morning. The 9-year-old tiger has had two previous litters. The father of this cub is Malosi, who moved to Point Defiance from Honolulu Zoo last year as part of the Sumatran tiger Species Survival Plan. The cub's gender wasn't immediately determined.