A four pound bundle of joy arrived at Dublin Zoo Sunday. Mother Lana is guarding her infant Gorilla around the clock and it may be some time before keepers have a chance to get a closer look and determine its sex. Keeper Ciaran McMahon said: "We are over the moon with the birth of the baby Gorilla. The new arrival is a great success for Dublin Zoo as part of the European breeding programme for these critically endangered primates. We are one of a few zoos to have a Gorilla family living together and we can see that the bonds between the group are very strong. The youngster is doing very well, within minutes the baby was feeding from mum, Lena, which is a very good sign. We can tell that the infant is strong because there are a lot of head movements."