Blue-breasted Blue Flycatcher

It was formerly conspecific with the rufous-breasted blue flycatcher from south Luzon. It was split as a separate species based on the male's eponymous blue breast. As the rufous-breasted flycatcher is an extremely rare bird and there are barely and specimens, the differences between the two species' females are poorly understood.

Its natural habitat is tropical moist lowland forest up to 1,200 m. It is often seen in lowland and foothill forest and secondary forest with bamboo,. The IUCN Redlist has classified this species as near threatened. Its threats are mainly habitat loss due to deforestation for lumber, mining and farmlands. There are no known targeted conservation actions for this bird, but it will indirectly benefit from the conservation of other north Luzon species like the critically endangered Isabela oriole. The stronghold of the Isabela oriole in Baggao is being proposed as a protected area and will thus preserve key habitat for this bird. It is found in a few protected areas includings Mount Makiling, Quezon Protected Landscape, Northern Sierra Madre Natural Park, Aurora Memorial National Park and Kalbario–Patapat Natural Park but actual protection from deforestation is still lax.

This species is poorly known. Stomach contents from specimens taken contained insects. This species forages close to the forest floor in the dense understorey. It is extremely unobtrusive and is usually alone or in a pair. Its exact breeding season is still unknown. Males found in breeding condition with enlarged testes found in May to July. A juvenile was seen in April to May. The only recorded nest was recorded in May in a shallow cavity on a rock along a stream. This nest was cup-shaped lined with ferns and an outer layer of moss and contained three eggs. Nest parasitism by the Sunda brush cuckoo has been recorded.