Rusty-magined Flycatcher

Quick Facts

• Scientific Name: Myiozetetes cayanensis
• Spanish Name: Sirirí alicastaño
• Family: Tyrannidae
• Known Nicknames: Rusty-margined Flycatcher, Bem-te-vi-de-asa-ruiva, Mosquero de Orilla
• Average Length: 16.5–18 cm / 6.5–7 in
• Average Weight: 24–30 g / 0.85–1.06 oz
• Wingspan: 28–32 cm / 11–12.5 in
• Key Feature: Distinctive rufous-edged wing feathers and a concealed orange-red crown patch
• Primary Diet: Omnivore (Primarily Insects and Berries)
• Range: Northern and central South America, including the Amazon Basin, Brazil, Colombia, and Venezuela
• Habitat: Open areas near water, forest edges, and tropical lowland evergreen forests
• Social Structure: Pairs or small family groups
• Nesting/Breeding: Large, globular domed nests made of grass and plant fibers
• Conservation Status: Least Concern (LC)
• Population Trend: Stable

The Rusty-margined Flycatcher (*Myiozetetes cayanensis*) is a vibrant and social songbird native to the tropical lowlands of Central and South America, easily recognized by its striking combination of olive-brown upperparts and brilliant yellow underparts. Its namesake feature is the subtle yet distinct rufous or "rusty" edging on its wing feathers, which complements a bold white facial stripe that wraps around its head to frame a dark crown—often concealing a hidden, fiery orange-red crest. Remarkably gregarious and vocal, these birds are frequently found near water or open clearings, where they exhibit the unique behavior of building large, conspicuous dome-shaped nests with side entrances. With their sharp eyesight and agile flight, they are master aerialists, frequently seen darting from perches to snatch insects mid-air in a display of precision and energy.

Fun Facts

The Rusty-margined Flycatcher employs a clever "bodyguard" strategy by frequently building its bulky, domed nests near active wasp colonies to discourage arboreal predators. These bold birds are also surprisingly versatile hunters, occasionally mimicking kingfishers by diving into shallow water to snatch up tiny fish and tadpoles. Beyond their namesake rufous wing edges, they are known for their high-energy "social hour" displays, where pairs engage in loud, synchronized wing-shivering and screeching to aggressively defend their territory from much larger intruders.

Habitats & Distribution

This species thrives in open and semi-open landscapes, frequently favoring areas near water such as riverbanks, lakeshores, and marshes. It is highly adaptable to human-altered environments, commonly inhabiting gardens, city parks, pastures, and agricultural clearings, as well as forest edges and secondary growth forests. Its geographical range spans across much of northern and central South America, extending into southern Central America. It occurs from Panama through Colombia, Venezuela, and the Guianas, stretching south across Brazil to Bolivia, Peru, and eastern Ecuador. It is primarily found in lowland regions, typically remaining at elevations below 1,500 meters.

Behaviours & Reproduction

These birds are highly social and territorial, typically found in pairs or small family units throughout the year. They are known for their assertive behavior, frequently engaging in loud vocalizations and aggressively mobbing potential predators or larger avian species that enter their domain. This social structure revolves around a stable pair bond, with both individuals actively participating in defending their foraging grounds and nesting sites, which are often located near bodies of water. During the breeding season, the pair constructs a distinctive, bulky globular nest with a side entrance, using dry grasses and plant fibers. A notable reproductive strategy involves building these nests in close proximity to social wasp colonies, which provides a significant layer of protection against arboreal predators. The female typically lays two to four eggs, and while she primarily handles incubation, both parents are deeply involved in feeding and protecting the fledglings until they achieve independence.

Diet

The Rusty-margined Flycatcher is primarily an insectivore, though it maintains a surprisingly varied omnivorous diet that shifts based on seasonal availability. It mainly hunts by sallying out from a perch to snatch flying insects such as beetles, bees, and dragonflies directly from the air, or by gleaning them from foliage. Beyond its reliance on invertebrates, this species frequently consumes small fruits and berries, which provide essential nutrients when insect populations are low. An especially intriguing aspect of its feeding behavior is its opportunistic nature near water; it has been documented performing "kingfisher-like" maneuvers to pluck small tadpoles and tiny fish from the surface. This dietary flexibility allows the bird to thrive in diverse environments, ranging from dense forest edges to urban gardens, by effectively exploiting both terrestrial and aquatic food sources.

Colors

The Rusty-margined Flycatcher features bright yellow underparts, a white throat, and olive-brown upperparts. Its head is marked by a bold white eyebrow stripe and a dark eye mask, while its namesake trait is the distinct rufous or "rusty" edging on its wing feathers. This combination of vibrant yellow and earthy tones provides effective camouflage within sun-dappled tropical foliage.