Sometimes thought to form a species-group with R. plicatus. Has in the past been considered conspecific with latter or with R. undulatus, but differs from both in size, bill morphology and bare-part colours; evidence from feather lice (Mallophaga) inconclusive, different louse genera pointing towards potential relationships with one or other of aforementioned species. Monotypic.
S Myanmar, W & S Thailand and N Peninsular Malaysia; previous reports from N Myanmar, India and Sumatra were result of misidentifications.
Food and feeding
Status and conservation
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