Sumatran Erpornis (Erpornis zantholeuca ssp. saani)
This taxon was described in 1939; it is apparently known from a single specimen that had been obtained somewhere in north-western Sumatra, Indonesia as well as from three additional records.
The Sumatran birds differ from the other subspecies by their greenish back and a slightly darker crest.
This taxon might well be extinct now.
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The photo below shows another subspecies, the Greyish Erpornis (Erpornis zantholeuca ssp. canescensDelacour & Jabouille) which is endemic to the island of Borneo, Indonesia.
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edited: 24.01.2024