One of the most common owls in forests across northern North America (and across the U.S. in winter), saw-whets are highly nocturnal and seldom seen. Their high-pitched <em>too-too-too</em> call is a common evening sound in evergreen mountain forests …

One of the most common owls in forests across northern North America (and across the U.S. in winter), saw-whets are highly nocturnal and seldom seen. Their high-pitched call is a common evening sound in evergreen mountain forests from January through May.

The northern saw-whet owl was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae.He placed it with the other owls in the genus Strix and coined the binomial name Strix acadicus. [3] Gmelin based his description on the "Acadian owl" from Nova Scotia that had been described and illustrated in 1781 by ...

Northern Saw-whet Owl (Aegolius acadicus) Close side view of a Northern Saw-whet Owl looking at us ©

7" (18 cm). A very small owl with no "ear" tufts. Overall warm brown, with reddish streaks on white chest. Juveniles in summer are chocolate brown with tawny buff belly, white eyebrows. In far north, see Boreal Owl (rare).

Pint-sized owl of the U.S., Canada, and Mexico; found in northern forests and western mountains. Prefers areas with conifers and thick understory. Fairly common, but shy and difficult to see. Patterned with brown and white overall, with streaked white forehead and blotchy rusty-brown streaks below. No ear tufts.

Northern Saw-whet Owl (Aegolius acadicus) profile Close side view of a Northern Saw-whet Owl ©

Side view of a Unspotted Saw-whet Owl looking down from a branch at night - San Christobal, Chiapas, Mexico

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Age determination of Northern Saw-whet Owls is almost always based on the molt pattern among the primaries and secondaries, which is more easily viewed under ultraviolet light. While wing chord alone may be enough to identify some males (<128 mm) or females (>143 mm), there are many in the range of overlap that can be determined in combination ...