Gracula robusta
Also known as: Gracula religiosa robusta
AviList (2026) treats this bird as a subspecies, Gracula religiosa robusta, of the Common Hill Myna (Gracula religiosa), which is also on this site. IOC lists it as a separate species.
Range
Nias, Indonesia
The Nias myna, or Nias hill myna, is a hill myna of Nias Island that is widely accepted as distinct from the common hill myna. The account used here describes the common hill myna rather than this form separately (Wikipedia, general species account).