As implied by their name, members of this genus have but three toes, two in front and one behind. The plumage of this species is entirely black above, and whitish below, with the flanks barred with blackish. The male has a yellow patch on the crown. They breed abundantly in coniferous forests in mountainous regions throughout their range, laying their eggs in cavities in decayed stumps and trees, apparently at any height, from five feet up. The eggs are laid in May or June. Size .95 x .70.
Three-toed Woodpecker. Arctic Three-toed Woodpecker.