Northern Bentbill (Oncostoma cinereigulare) [XC620477]
by Charlie Vogt from Lagos de Montebello, Chiapas, Mexico (song)
Northern Bentbill (Oncostoma cinereigulare) [XC319761]
by Manuel Grosselet from Ixhuatlan del Sureste, Veracruz, Mexico (song)
Subspecies
Has been suggested by some authors that genus be joined with closely affiliated Hemitriccus or Lophotriccus. However, bill morphology and peculiar voice viewed by others as sufficiently distinct to support retention of separate genus. Forms a superspecies with Southern Bentbill (Oncostoma olivaceum), and sometimes considered conspecific. Distribution somewhat uncertain.