Olive-backed Woodcreeper (Xiphorhynchus triangularis) [XC249387]
by Niels Krabbe from Napo: km 11.6 Narupa-Loreto road, Ecuador (call)
Olive-backed Woodcreeper (Xiphorhynchus triangularis) [XC264576]
by Jonas Nilsson from Napo: 'Caba\u00f1as San Isidro', 1-2 km SW Cosanga, Ecuador (song)
Subspecies
Sister-species to Northern Spotted Woodcreeper (Xiphorhynchus erythropygius). The two sometimes regarded as forming a superspecies, or as conspecific. Treatment as separate species supported by molecular evidence, vocalizations, apparent lack of intergradation, and elevational replacement where ranges approach (at most, very limited sympatry on western slope of Andes in south-western Colombia and western Ecuador). Described subspecies distinctus (from western Andes of Colombia) synonymized with nominate; hylodromus differs only slightly from nominate, but is geographically disjunct; intermedius intergrades with and possibly indistinguishable from bangsi.
The following 4 subspecies are recognised:
hylodromus Wetmore, 1939 - Coastal and interior mountains of northern Venezuela (Andes in Trujillo and south-eastern Lara, Yaracuy east to Miranda and Distrito Federal).
triangularis (Lafresnaye, 1842) - Andes of western Venezuela (Zulia, south-western Táchira, Mérida), Colombia (western, central and eastern cordilleras except in western Nariño), eastern Ecuador and northern Peru (north of R Marañón).
intermedius Carriker, 1935 - Andes of central Peru (Pasco, Junín).
bangsi Chapman, 1919 - Eastern Andean slopes from south-eastern Peru south to central Bolivia (La Paz, Cochabamba, western Santa Cruz), intergrades with intermedius in south-eastern Peru.
BirdLife International Species Factsheet