A rare and little-studied species, very little is known about the biology and behaviour of the pirre warbler. However, like other birds of the family Parulidae, also known as the New World warblers or the wood warblers, the pirre warbler probably eats insects, which are gleaned off leaves or stems as its weaves its way through the foliage of bushes and trees. Fruit or flower nectar may also be consumed (6).
There is also almost nothing known about reproduction in the pirre warbler. However, New World warblers tend to be fiercely territorial during the breeding season. They typically form monogamous, but often polygamous, pairs, with the female doing most of the nest construction, as well as the incubation, which lasts for 10 to 14 days. The chicks usually remain in the nest for 8 to 12 days before fledging (6).