Aegolius

Aegolius is a genus of small true owls. Three of the extant species are restricted to the New World, but the Boreal Owl has a circumpolar range through North America, Eurasia, the Alps and the Rockies.

The species are:

These are essentially nocturnal woodland owls of temperate or colder climates; the two northern species breed in North America’s coniferous forests, and the unspotted saw-whet owl and buff-fronted owl (Central and South America respectively) are species of mountain, cloud or oak forests.