They're not difficult to breed, but you do need a pair to start with (

), space and good nesting sites.
The parents of those babies were bred by a facility at which I used to work and, as I was involved in the process, were incubated, hatched and raised for the first while here in my home. I have been corresponding with the person in charge of the perenties at Black Hills regarding breeding them over there and am glad he succeeded. I hope they remain within AZA facilities.