Serpophaga nigricans
The Sooty Tyrannulet (*Serpophaga nigricans*) is a diminutive and distinctive member of the Tyrannidae family, the New World flycatchers, known for its preference for rocky, riparian habitats. Averaging 11-12.5 cm (4.3-4.9 inches) in length and weighing a mere 7-9 grams (0.25-0.32 oz), this small passerine is characterized by its overall dusky gray to sooty-black plumage, which is paler on the belly and undertail coverts. Subtle field marks include often faint white wing bars, a dark bill, da...
Primarily found in riparian zones along fast-flowing rivers, streams, and rocky creeks, often preferring areas with exposed boulders and shrubby vegetation. Typically occurs at low to moderate elevations, though it can reach up to 2,000 meters in some parts of its range.
Feeds almost exclusively on small insects, including flies, beetles, and small caterpillars. Forages primarily by sallying from low perches over water or gleaning from rocks and vegetation.
Sooty Tyrannulets are active, diurnal birds often observed in pairs or small family groups, rarely joining mixed-species flocks. They exhibit a characteristic tail-wagging behavior, often flicking their tail up and down while perched. Foraging primarily involves short, agile sallies from low perc...
The Sooty Tyrannulet is resident across a significant portion of southern South America. Its distribution spans from central Bolivia and southwestern Brazil, through Paraguay and Uruguay, extending south into Argentina and Chile. In Argentina, it is found throughout the northern and central regio...
Least Concern
- The Sooty Tyrannulet is one of the few Tyrannidae species that is almost exclusively tied to riparian habitats, distinguishing it from many of its more terrestrial relatives. - It exhibits a characteristic tail-wagging behavior, constantly flicking its tail up and down, which is a useful identi...