The black woodpecker (Dryocopus martius) is a large woodpecker that lives in mature forests across the northern Palearctic. It is the sole representative of its genus in that region. Its range is expanding. The black woodpecker is easily the largest woodpecker species in Europe as well as in the portion of Asia where it lives and is one of the largest species worldwide. This non-migratory species tends to make its home in old-growth forest or large forest stands and excavates a large tree hole to reside in. In turn, several species rely on black woodpeckers to secondarily reside in the holes made in trees by them. This woodpeckers diet consists mostly of carpenter ants. This species is closely related to, and fills the same ecological niche in Europe as, the pileated woodpecker of North America and the lineated woodpecker of South America, also being similar to the white-bellied woodpecker which is distributed to the south somewhat of the black woodpecker in Asia. Taxonomy The black woodpecker was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Picus martius. Linnaeus gave the locality as Europe, but this is now taken to be Sweden. The black woodpecker is now placed in the genus Dryocopus that was introduced by the German naturalist Friedrich Boie in 1826. Two subspecies are recognised: D. m. martius (Linnaeus, 1758) – western Europe to the Kamchatka Peninsula and Japan D. m. khamensis (Buturlin, 1908 – Tibet and southwestern China Description The black woodpecker measures long with a wingspan. Body weight is approximately on average. Among standard measurements, the wing chord is , the tail is , the very long bill is and the tarsus is . It is easily the largest woodpecker in its range and is second in size only to the great slaty woodpecker amongst the woodpecker species certain to exist (with the likely extinction of the largest and second largest woodpeckers), although its average mass is similar to that of the Magellanic woodpecker of South America. The closely related pileated and white-bellied woodpeckers also broadly overlap in size with the black woodpecker, but both are somewhat smaller in average and maximal size and mass. The plumage of this crow-sized woodpecker is entirely black apart from a red crown. In males, the entire crown is red, but in females only the top hindcrown