Striped Owl

Asio clamator

Foz Do Iguaçu Paraná Brazil

Quick Facts

  • Scientific Name: Asio clamator
  • Spanish Name: Búho gritón
  • Family: Strigidae
  • Known Nicknames: Striped Eared-Owl, Coruja-listrada, Búho Gritón
  • Average Length: 30–38 cm / 12–15 in
  • Average Weight: 300–550 g / 10.6–19.4 oz
  • Wingspan: 80–90 cm / 31–35 in
  • Key Feature: Long, prominent dark ear tufts and heavy black vertical streaking on the breast and belly
  • Primary Diet: Carnivore (Small mammals, birds, reptiles, and large insects)
  • Range: Southern Mexico through Central America to Northern Argentina and Uruguay
  • Habitat: Open and semi-open landscapes, including savannas, grasslands, marshes, and agricultural fields
  • Social Structure: Solitary or Paired
  • Nesting/Breeding: Ground nests hidden in tall grass or dense vegetation; occasionally tree hollows
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Striped Owl (*Asio clamator*) is a striking medium-sized raptor native to Central and South America, instantly recognizable by its exceptionally long, prominent ear tufts and the bold, vertical blackish-brown streaks that adorn its pale, buff-colored underparts. Its distinctive heart-shaped facial disc is a crisp white, framed by a sharp black border that accentuates its intense, cinnamon-colored eyes, giving the bird an alert and commanding presence. Unlike many of its forest-dwelling relatives, this owl often frequents more open landscapes such as savannas, marshes, and pastures, where it utilizes its silent flight and powerful talons to hunt small mammals. True to its scientific name *clamator*, which means "shouter," this species is notably vocal, often announcing its presence with a series of loud, rhythmic barking calls that pierce the nocturnal landscape.

Fun Facts

Unlike many of its forest-dwelling relatives, the Striped Owl frequently chooses to nest directly on the ground amidst tall grasses, a daring strategy for a bird of prey. Its scientific name, *clamator*, translates to "shouter," referencing its surprisingly loud, repetitive barking calls that can easily be mistaken for a distant dog. When feeling threatened, this owl performs a dramatic transformation by puffing out its feathers to nearly double its perceived size while snapping its beak with the intensity of a cracking whip. Additionally, its signature long ear tufts are entirely for show; these feathers are used for social signaling and camouflage rather than assisting with the bird's actual hearing.

Habitats & Distribution

This species is widely distributed across Central and South America, ranging from southern Mexico through the Central American isthmus and into most of South America east of the Andes. Its territory extends as far south as northern Argentina, Uruguay, and southern Brazil. While it is present in many regions, it is generally absent from high-altitude Andean zones and the dense, unbroken interior of the Amazon rainforest. It primarily inhabits open and semi-open landscapes, showing a strong preference for savannas, grasslands, marshes, and pastures with scattered trees or thickets. It is frequently found along woodland edges and in agricultural areas where it can hunt in clearings. Increasingly, it has adapted to human-altered environments, including suburban areas and city parks, provided there is sufficient foliage for roosting during the day.

Behaviours & Reproduction

This species is primarily nocturnal and crepuscular, spending its daylight hours roosting in dense vegetation or tall grass. It is generally solitary but maintains a strong territorial presence, using its distinct hooting calls to communicate with rivals and mates. When confronted by threats, it exhibits a characteristic defensive display, puffing out its feathers and spreading its wings to significantly increase its perceived size. Reproduction involves monogamous pair bonds, with breeding cycles often coinciding with the local dry season. A notable reproductive strategy is its preference for nesting on the ground amidst thick grass or shrubs, though it occasionally utilizes abandoned stick nests in low trees. The female typically lays two to four eggs and performs the bulk of the incubation, while the male is responsible for hunting and bringing prey to the nest to support the female and the growing chicks.

Diet

The Striped Owl is a versatile and opportunistic nocturnal predator that primarily feeds on a diverse array of small vertebrates and large invertebrates. Its diet is dominated by small mammals, such as rodents, bats, and small opossums, but it also frequently consumes birds like doves and various passerines, as well as reptiles, frogs, and insects like beetles or grasshoppers. An interesting aspect of its feeding behavior is its ability to adapt to local environments, often shifting its prey choice based on seasonal availability. Furthermore, despite its medium size, the Striped Owl is capable of taking down prey that is surprisingly large relative to its own body weight, such as larger rodents or birds. Like other owls, it typically swallows smaller prey whole and later regurgitates the indigestible parts, such as fur and bone, in the form of compact pellets, which allows researchers to precisely document its dietary impact on local ecosystems.

Colors

The Striped Owl is characterized by a distinctive white facial disc framed by a bold black border and prominent, dark ear tufts. Its plumage consists of a buff or tawny base heavily marked with dense, blackish vertical streaks across the upperparts and pale underparts. These high-contrast longitudinal stripes, paired with brownish-orange eyes, provide masterful camouflage by mimicking the textures of bark and shadows in its woodland habitat.