Unspotted Saw-whet Owl (Aegolius ridgwayi) [XC879944]
by Mike Nelson from Chiabal, Huehuetenango, Guatemala (song and call)
Unspotted Saw-whet Owl (Aegolius ridgwayi) [XC346270]
by Teet Sirotkin from Los Naranjos, Boquete, Provincia de Chiriqu\u00ed, Panama (alarm call)
Subspecies
Aegolius acadicus (Sibley and Monroe 1990, 1993) has been split into Saw-whet Owl (Aegolius acadicus) and Unspotted Saw-whet Owl (Aegolius ridgwayi) following AOU (1998). This treatment has always been followed by BirdLife.
Possibly forms superspecies with Saw-whet Owl (Aegolius acadicus), although ranges appear to overlap in southern Mexico (with apparent hybridization). Perhaps conspecific with Saw-whet Owl (Aegolius acadicus). Validity of subspecies uncertain: suggested that both tacanensis and rostratus perhaps in fact hybrids between this species and Saw-whet Owl (Aegolius acadicus).