Myrmotherula assimilis
The Leaden Antwren (Myrmotherula assimilis) is a petite and elusive passerine endemic to the Amazon basin, embodying the subtle beauty of its family. Males are characterized by their striking leaden gray plumage, darker on the upperparts, contrasting with a clean white throat and a distinct black patch on the chest, often bordered by fine white streaking. They typically measure around 9.5-10.5 cm in length and weigh about 7-9 grams. Females present a different, though equally refined, appeara...
Found primarily in lowland tropical moist forests, specifically preferring várzea (flooded forest) and igapó (swamp forest) habitats along rivers and oxbow lakes, typically at elevations below 500 meters.
Primarily insectivorous, feeding on small arthropods including spiders, caterpillars, and beetles, which are gleaned from foliage.
Leaden Antwrens are diurnal and generally observed singly or in pairs, often joining mixed-species foraging flocks, particularly with other antwrens and small passerines, to exploit food resources more efficiently. They forage primarily by gleaning small arthropods from the underside of leaves an...
The Leaden Antwren is widely distributed across the Amazon basin in South America, spanning parts of Brazil, Bolivia, Peru, Colombia, and Ecuador. Its breeding range largely overlaps with its year-round resident range, as it is a non-migratory species. It is primarily found along the major river ...
Least Concern
- Despite their name, Leaden Antwrens are not obligate army ant followers; they occasionally associate with ant swarms but primarily glean insects from vegetation. - Their preferred habitat of seasonally flooded forests means they are highly adapted to a dynamic environment, often nesting in area...