@Goura not a clue I'm afraid. I saw two individuals in the enclosure, both looked adult to my untrained eye. It's the same individual in both of the pics I uploaded it that helps?
@Goura I think the breeding pairs will remain off-show. The birds that were put on-show last summer still had some blue flecks in their plumage, so I guess they were two of the 2016 hatchlings. I believe that both are the same sex, so I hope they will be paired up in breeding aviaries soon and that younger birds can be put on-show.