Rare cacique found very locally in lowland forest in southeastern Peru and extreme SW Brazil, especially near forest-fringed lakes and rivers. Note yellow rump and pale blue eye, which separate it from Solitary Black Cacique. Told from Yellow-rumped Cacique by the yellow being limited to the rump in Selva. No overlap with the closely related Ecuadorian Cacique. It has a varied vocal repertoire, with whistles, metallic squeaks, and various buzzing notes, among other calls.