The monotypic group White-crowned Forktail (Bornean) Enicurus leschenaulti borneensis is recognized as a separate species, Bornean Forktail Enicurus borneensis, based on elevational segration from lowland White-crowned Forktail withd strong genetic divergence (Moyle et al. 2005, 2017), and vocal differences (Eaton et al. 2021).