The grey sibia (Heterophasia gracilis) is a species of bird in the family Leiothrichidae.
It is namely present across the Purvanchal Range and western Hengduan Mountains.
Its natural habitat is subtropical or tropical moist montane forest.
References
Collar, N. J. & Robson C. 2007. Family Timaliidae (Babblers) pp. 70 – 291 in; del Hoyo, J., Elliott, A. & Christie, D.A. eds. Handbook of the Birds of the World, Vol. 12. Picathartes to Tits and Chickadees. Lynx Edicions, Barcelona.