Whiskered Screech-Owl

The Whiskered Screech-Owl (Megascops trichopsis) is a small, highly nocturnal raptor native to the montane forests of the southwestern United States down through Mexico and Central America. Famously cryptic, this species spends its days perfectly camouflaged against the bark of oak and pine trees. While it looks remarkably similar to its close relative, the Western Screech-Owl, the Whiskered Screech-Owl is smaller, occupies a higher-elevation ecological niche, and possesses distinctive long rictal bristles (the "whiskers") around its facial disc.

Identifying a Whiskered Screech-Owl visually can be a major challenge due to its similarity to the Western Screech-Owl.

Key Field Marks:

• Size: Noticeably smaller than the Western Screech-Owl, about the size of a large sparrow or small thrush.
• Plumage: Typically occurs in a gray morph in the United States (a rufous morph exists but is rare in the north). The underparts feature heavy, dark, vertical streaks crossed by dense horizontal bars, creating a messy "herringbone" or cross-hatched pattern that is denser than on the Western Screech-Owl.
• Facial Disc: Framed by a dark border. The rictal bristles around the bill are conspicuously long, though they are rarely visible unless viewed extremely close or in hand.
• Bare Parts: Eyes are bright yellow. The bill is greenish-yellow to olive-gray.
• Feet: Exceptionally small feet compared to other screech-owls.

Similar Species:

• Western Screech-Owl: Larger, has larger feet, coarser and less dense patterns on the underparts, and lacks the long facial bristles. Best distinguished by voice.
• Flammulated Owl: Has dark brown or blackish eyes (not yellow) and much shorter, less prominent ear tufts.

The Whiskered Screech-Owl is highly habitat-specific, residing in montane pine-oak woodlands, oak groves, and sycamore-lined canyons at elevations generally ranging from 1,000 to 2,500 meters (approx. 3,300 to 8,200 feet).

Range and Migration:

• Geographic Range: Its range extends from the "Sky Islands" of southeastern Arizona and the extreme southwestern corner of New Mexico, southwards through the highlands of Mexico to Guatemala, El Salvador, and Honduras.
• Migration: This species is a year-round resident throughout its range. It does not undertake long-distance migrations, although some individuals may perform minor altitudinal movements to lower elevations during harsh winter weather.

As a strictly nocturnal species, the Whiskered Screech-Owl is rarely seen active during hours of daylight.

Vocalizations:

Voice is the most reliable way to identify this owl. It has two primary songs:

1. The Syncopated Call: A rhythmic, Morse-code-like series that goes boot, boot-boot, boot, often compared to a rhythmic bouncing ball but with an uneven, syncopated tempo.
2. The Dusk Call: A series of 4 to 8 evenly spaced, hollow notes (boo-boo-boo-boo) that does not accelerate or decelerate.

Foraging & Diet:

This owl is highly insectivorous. It hunts primarily from perches, dropping down to seize beetles, moths, crickets, caterpillars, centipedes, and scorpions from the ground or tree trunks. It will occasionally take small bats, rodents, or small birds.

Nesting:

Breeding occurs from April to July. They do not build their own nests, instead utilizing abandoned woodpecker cavities (such as those made by Arizona Woodpeckers or Northern Flickers) in oaks, pines, or sycamores. The female lays 3 to 4 white eggs, which she incubates for about 26 days while the male provides food.