Margarornis squamiger
The Pearled Treerunner (Margarornis squamiger) is a captivating Neotropical passerine, measuring 14-16 cm (5.5-6.3 inches) in length and weighing a mere 14-20 grams (0.5-0.7 oz). This small, active bird is characterized by its dull olive-brown upperparts, contrasting with rufous wings and a similarly rufous, stiff-shafted tail. Its most striking feature, and the origin of its common name, is the dense "pearled" or scaled appearance of its buffy to pale yellow underparts, created by fine white...
This species exclusively inhabits moist, humid montane cloud forests and evergreen forests, typically at elevations ranging from 1,500 to 3,000 meters, occasionally venturing higher. It prefers areas with dense moss and epiphyte growth on tree trunks and branches.
The Pearled Treerunner primarily consumes small arthropods, including insects and spiders, which it gleans and probes from moss, lichen, and bark surfaces. Occasionally, it may also consume small seeds.
The Pearled Treerunner is a highly active, diurnal bird, constantly in motion as it forages. Its most distinctive behavior is its acrobatic foraging style: it meticulously climbs tree trunks and larger branches, often spiraling upwards or downwards like a nuthatch, probing moss, lichen, and bark ...
The Pearled Treerunner is a resident species distributed exclusively along the Andean mountain chain of South America. Its extensive range spans from the coastal mountains of northern Venezuela, through the entire Andes of Colombia, Ecuador, and Peru, extending south into central Bolivia. This sp...
Least Concern
- The "Pearled" in its name refers to the distinctive pearly white spots covering its buffy underparts, which give it a scaled appearance. - Despite its name, Pearled Treerunners are not closely related to true creepers (family Certhiidae) but belong to the Furnariidae family, known as the ovenbi...