The white-bellied erpornis, or simply erpornis, is a small passerine bird that is the only member of the genus Erpornis. It was formerly placed in the family Yuhina, but it is actually more closely related to the vireos, which are only found in the New World. Perhaps they are a representative of an early branch in the vireo family tree left in the Old World.
The erpornis resembles vireos in many ways, though it has a crest resembling yuhinas. Their crests, backs, and wings are a mix of olive, brown, and grey, while their underparts are white.