The Steller's jay (Cyanocitta stelleri) is a jay native to western North America, closely related to the blue jay found in the rest of the continent (aside from northern Canada), but with a black, blackish-brown or dark blue head and upper body. It is also known as the long-crested jay, mountain jay, and pine jay. It is the only crested jay west of the Rocky Mountains.

Steller's jay shows a great deal of regional variation throughout its range. Blackish-brown-headed birds from the north gradually become bluer-headed farther south. The Steller's jay has a more slender bill and longer legs than the blue jay and has a much more pronounced crest. It is also somewhat larger.

The head is blackish-brown, black or dark blue, depending on the latitude of the bird, with lighter streaks on the forehead. This dark coloring gives way from the shoulders and lower breast to silvery blue. The primaries and tail are a rich blue with darker barring. Birds in the eastern part of its range along the Great Divide have white markings on the head, especially over the eyes; birds further west have light blue markers and birds in the far west along the Pacific Coast have small, very faint, or no white or light markings at all.

Source
Wikipedia