Yungas screech owl

The Yungas screech owl (Megascops hoyi), also recognized as the montane forest screech-owl or Hoy's screech owl, is a distinct species of owl found in the high-altitude forests of South America. Its range spans from south-central Bolivia into northwestern Argentina, inhabiting moist montane and cloud forest environments characterized by tall trees and abundant epiphytes.

Description and Appearance

This owl is relatively small, measuring between 23 to 24 centimeters in length. It exhibits a striking polymorphism, appearing in brown, gray, and rufous plumage morphs, which likely aid in camouflage within its varied forest habitat. Key physical characteristics include a gray-brown facial disc, prominent white brows above bright yellow eyes, and small, pointed "ear" tufts. The upperparts are typically brown, with variations in gray or rusty tones depending on the morph, and are marked with fine dark vermiculation and streaks. A distinctive feature on the closed wing is a row of large white spots. The tail is striped and vermiculated with light brown. Its underparts are a lighter shade of gray to gray-brown, often with an ochre wash, and the breast and flanks are marked with noticeable black streaks.

Distribution and Habitat

The Yungas screech owl's geographic distribution is confined to the Andean montane regions of Bolivia and Argentina. It thrives in moist montane forests and cloud forests, typically found at elevations ranging from 1,000 to 2,600 meters, though it has been observed as high as 2,800 meters. These habitats are defined by the presence of tall trees and a rich growth of epiphytes. While largely sedentary, there is evidence suggesting that individuals nesting at higher elevations may undertake seasonal movements to lower altitudes during winter months.

Behavior and Ecology

The foraging behavior of the Yungas screech owl involves hunting on and near the ground, along forest edges, and within the upper canopy of the forest. Its diet is predominantly composed of insects and spiders, though it is also known to consume small vertebrates. Breeding is thought to commence at the start of the rainy season, during September and October. The owls primarily nest in natural tree cavities, often utilizing abandoned woodpecker holes.

Vocalization

A notable aspect of the Yungas screech owl's behavior is its vocalization, particularly the duet performed by pairs. The primary song is described as starting softly, escalating into a rapid staccato of 'u' notes, and then gradually fading. The female's vocalizations are distinctly higher in pitch compared to the male's. A secondary, shorter song is also part of their repertoire.

Conservation Status

The International Union for Conservation of Nature (IUCN) has assessed the Yungas screech owl as a species of Least Concern. This designation reflects its status as not uncommon in certain areas and the protective effect of the inaccessibility of parts of its natural range, which offers a degree of refuge from human disturbance.