Pico ártico

The black-backed woodpecker (Picoides arcticus), also known as the Arctic three-toed woodpecker, is a medium-sized woodpecker (23 cm (9.1 in) long) inhabiting the forests of North America. == Taxonomy == The black-backed woodpecker was described and illustrated by the English naturalist William Swainson in 1832 from a specimen collected near the source of the Athabasca River on the eastern slopes of the Rocky Mountains in Alberta, Canada. He coined the binomial name Picus arcticus. The specific epithet arcticus is the Latin word for "northern" or "arctic". The black-backed woodpecker is now placed in the genus Picoides which was erected by the French naturalist Bernard Germain de Lacépède in 1799. The species is monotypic: no subspecies are recognised. == Description == The plumage of adults is black on the head, back, wings and rump. They are white from the throat to the belly; the flanks are white with black bars. Their tail is black with white outer feathers. There is an element of sexual dimorphism in the plumage, with the adult male possessing a yellow cap. Unlike all other true woodpeckers except the related American and Eurasian three-toed woodpeckers, this species has three-toed feet. Measurements: Length: 9.1 inches (23 cm) Weight…