Yellow Tyrannulet

Capsiempis flaveola

The yellow tyrannulet (Capsiempis flaveola) is a very small passerine bird in the tyrant flycatcher family. It breeds from Nicaragua south to northeastern Argentina and southeastern Brazil. It is the only member of the genus Capsiempis, but its taxonomy is uncertain, and it has been allocated to at least three other genera in the past.

This species is found in thickets, forest and streamside edges, dense second growth, and bushy pastures or clearings. The cup nest is made of plant fibre and grass blades, decorated outside with moss. It is placed 2–7 m high in a tree, shrub, or maize plant. The typical clutch is two white eggs, usually umarked or with very light rufous speckles.