Blue-backed Parrot (Tanygnathus sumatranus) [XC820489]
by id from Pekuburan Kel.Mongan Moningka, Kota Tomohon, Sulawesi Utara, Indonesia (call)
Blue-backed Parrot (Tanygnathus sumatranus) [XC820636]
by Mike Catsis from Sulawesi: Tangkoko lowlands, Indonesia (call)
Subspecies
Proposed subspecies mulleri is synonym of nominate, and indeed species formerly listed as Tanygnathus mulleri. Birds of Banggai have been awarded subspecies incognitus, based on supposedly different iris colour, but data come from unreliable labels. "Tanygnathus heterurus" (Rufous-tailed/Salvadori's Parrot) probably described from an aberrant specimen of present species.