Bar-breasted Piculet

The bar-breasted piculet (Picumnus aurifrons) is a species of bird in subfamily Picumninae of the woodpecker family Picidae. It is found in Bolivia, Brazil, Colombia, and Peru. == Taxonomy and systematics == The bar-breasted piculet has seven subspecies: P. a. aurifrons Pelzeln, 1870 P. a. transfasciatus Hellmayr & Gyldenstolpe, 1937 P. a. borbae Pelzeln, 1870 P. a. wallacii Hargitt, 1889 P. a. purusianus Todd, 1946 P. a. flavifrons Hargitt, 1889 P. a. juruanus Gyldenstolpe, 1941 Subspecies P. a. borbae and P. a. wallacii have at times been treated as individual species, with P. a. juruanus as a subspecies of borbae. == Description == The bar-breasted piculet is the smallest extant species in the highly diverse woodpecker family. A typical adult is about 7.5 cm (3.0 in) long and weighs 8 to 10 g (0.28 to 0.35 oz). Males average 9.2 g (0.32 oz) and females 8.6 g (0.30 oz). Among standard measurements, their wing chord is 4.4 to 5.3 cm (1.7 to 2.1 in), their tail 2.3 to 2.6 cm (0.91 to 1.02 in), their beak 0.9 to 1.2 cm (0.35 to 0.47 in), and their tarsus 1.1 to 1.2 cm (0.43 to 0.47 in). Adult males of the nominate…