The moustached wren is 15.5 cm (6.1 in) long and weighs 16.2 to 22.8 g (0.57 to 0.80 oz). The nominate adult has an olivaceous gray-brown crown and nape, bright chestnut back and rump, and a dull brown tail with narrow blackish bars. It has a white supercilium and eyering, a black stripe through the eye, gray-black cheeks streaked with white, a white moustachial stripe, and a black malar stripe. Its throat and upper chest are white, its lower chest buffy, and its flanks and belly deeper brown. Compared to the adult, the juvenile's crown is browner, its back duller and less deeply chestnut, and it has less well defined facial markings and more diffuse bars on the tail.[4]
P. g. juruanus is larger than the nominate and its underparts are paler. P. g. intercedens' crown is less sooty and its underparts are duller than the nominate's. P. g. bolivianus is similar to intercedens but its underparts are a deeper ochre compared to the nominate's buff and it has more gray on the face.[4]
The moustached wren is found throughout the central and southern Amazon Basin. The subspecies are distributed thus:[4]
P. g. juruanus, eastern Brazil from the Madeira River east to the Atlantic coast
P. g. genibarbis, the upper Amazon River drainage in eastern Peru, western Brazil as far east as the Madeira River, and probably northern and western Bolivia
P. g. intercedens, central Brazil's Mato Grosso and Goiás states
It inhabits forest edge, including along rivers, and favors dense stands of Bambusa bamboo. In elevation it ranges as high as 1,500 m (4,900 ft) in Bolivia but generally only from sea level to middle elevations.[4]
The moustached wren forages low in vegetation and often in pairs. Though its diet has not been documented, it is probably mostly or entirely invertebrates.[4]
Four nests of the moustached wren found in Peru's Manu National Park were domed or ball-like with a side entrance. They were all found with four eggs, in September and October. One adult incubated the eggs; it was assumed to be the female. Nothing else is known about the species' breeding phenology.[4]
The IUCN has assessed the moustached wren as being of Least Concern.[1] It is fairly common over its large range, its habitat is widespread and not excessively threatened, and it occurs in several protected areas.[4]
^Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 23 May 2021. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved May 24, 2021
^ abcdefghKroodsma, D. E. and D. Brewer (2020). Moustached Wren (Pheugopedius genibarbis), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.mouwre2.01 retrieved June 3, 2021
