3 CR species/subspecies grouped together in this aviary: Lesser Sulphur Crested Cockatoo (C.sulphurea), Citron Crested Cockatoo (C.s.citrinocristata) and Black Palm Cockatoo (P.a.aterrimus).
Parrot Paradise has undergone another major display shake-up (birds being relocated and regrouped in different aviaries; i think it's the 3rd time this year..). I'm don't know if it is being done for the parrots' enrichment or if the curators can't make up their minds.