The Red-billed Tyrannulet lives in humid montane forest on Peru’s eastern Andean slopes. It feeds in the canopy and subcanopy and may join mixed-species flocks.
Its mantle is olive-grey, with a grey crown and nape, a pale iris and a flesh-colored lower mandible. The breast is olive-yellow and becomes more yellow on the lower parts.
It feeds in the canopy and subcanopy of humid montane forest, often with mixed-species flocks.
An extinction-risk assessment has not been added yet.