Zimmerius improbus
The Spectacled Tyrannulet, *Zimmerius improbus*, is a diminutive and often inconspicuous member of the Tyrannidae family, characteristic of Neotropical montane forests. Measuring a mere 9.5-11 cm (3.7-4.3 inches) and weighing about 6-8 grams, this tiny flycatcher exhibits an olive-green coloration on its upperparts, contrasting with paler yellowish to whitish underparts. Its most distinctive field mark, giving rise to its common name, is a prominent pale yellowish loral area and supercilium t...
This species primarily inhabits humid montane evergreen forests, cloud forests, and forest edges, as well as adjacent secondary growth and clearings, typically at elevations ranging from 1,000 to 2,500 meters.
The diet of the Spectacled Tyrannulet consists predominantly of small insects and other arthropods, which it obtains by gleaning from vegetation and making short aerial sallies; it occasionally supplements this with tiny berries or fruit pulp.
Spectacled Tyrannulets are active, diurnal birds, often observed foraging solitarily or as part of mixed-species flocks, particularly with other small insectivores. Their foraging strategy involves actively gleaning insects from foliage and bark, or performing short, quick sally-strikes to snatch...
The Spectacled Tyrannulet has a disjunct distribution primarily within the Andes and related mountain ranges of northern South America, extending into parts of Central America. Its range spans from extreme western Panama, through the Andes of Colombia, Venezuela, and southward into western Ecuado...
Least Concern
- Despite their common name, the 'spectacles' are often more of a pale yellow lore and supercilium, rather than a distinct ring around the eye. - They are one of the smallest members of the extensive Tyrannidae family, which encompasses over 400 species. - Their persistent, high-pitched calls are...