The Dark-throated Oriole (Oriolus xanthonotus Horsfield) was thought to include four subspecies inhabiting parts of Southeast Asia including some islands of Indonesia as well as the island of Palawan north of Borneo; however, according to a recent study, it is now known that some of the populations are not closely related to each other at all.

Birds from northern Borneo and Palawan are more closely related to the Philippine oriole species and therefore should be treated as a distinct taxon for which the name Ventriloquial Oriole (Oriolus consobrinus Ramsay) has been suggested.

The new species is superficially identical to the Dark-throated Oriole but is somewhat smaller and can be distinguished by its song. [1]

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References:

[1] Frank E. Rheindt; Meng Yue Wu; Nyanasengeran Movin; Knud A. Jønsson: Cryptic species-level diversity in Dark-throated Oriole Oriolus xanthonotus. Bulletin of the British Ornithologists’ Club 142(2): 254-267. 2022

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edited:

20.07.2023