What is Blue jay?
{{Taxobox | name = Blue jay | image = Blue jay in PP (30960).jpg | image_width = 250px | image_caption = In [[Prospect Park (Brooklyn)|Prospect Park, Brooklyn]], New York | image2 = Cyanocitta cristata - Blue Jay - XC109601.ogg | status =LC | status_system = iucn3.1 | regnum = [[Animalia]] | classis = [[Aves]] | subclassis = [[Neornithes]] | ordo = [[Passeriformes]] | subordo = [[Passeri]] | familia = [[Corvidae]] | genus = ''[[Cyanocitta]]'' | binomial = ''Cyanocitta cristata'' | binomial_authority = [[Carolus Linnaeus|Linnaeus]], 1758 | range_map = Blue Jay-rangemap.png | range_map_width = 250px | range_map_caption = Global range: yellow: breeding only; green: resident all year blue: wintering only}} The '''blue jay''' (''Cyanocitta cristata'') is a [[passerine bird]] native to North America. It is known for being [[wikt:adapt|adaptable]], [[wikt:aggressive|aggressive]] and [[omnivorous]]. == Description == The blue jay measures 22–30&nbsp;cm (9–12 [[inch]]es) from bill to [[tail]] and weighs 70–100 [[gram]]s (2.47–3.53&nbsp;oz), with a wingspan of 34–43&nbsp;cm (13–17&nbsp;inches). There is a crown of feathers on the top of the head, which may be raised or lowered [[wikt:according|according]] to the bird's mood. When [[wikt:excited|excited]] or [[wikt:aggressive|aggressive]], the [[Crest (feathers)|crest]] may be fully raised. When scared, the crest comes outwards, brushlike. When the bird is [[Eating|feeding]] among other jays or resting, the crest is flattened to the [[head]], meaning that it is calm. Its plumage is [[lavender]]-[[blue]] to mid-blue in the crest, back, wings, and tail, and its face is [[white]]. The underside is off-white and the neck has a thin stripe with [[black]] which extends to the sides of the head. The main wing and tail feathers are deep with black, sky-blue and white. The bill, [[leg]]s, and [[eye]]s are all black. [[Male]]s and [[female]]s look nearly the same except that males are a little bit larger. Blue jays have strong black bills used for cracking open [[nut (fruit)|nut