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冠蓝鸦是雀形目鸦科冠蓝鸦属的鸟类。原产于北美洲,主要分布于美国落基山脉以东、圣皮埃尔和密克隆群岛和加拿大南部,属于新北界松鸦,与其他的鸦科亲缘关系较远,而在北美洲松鸦中,只有冠蓝鸦和暗冠蓝鸦有顶冠。它们适应性强,好奇好斗,聪明顽皮,杂食性,在几十年中已被引入多个新栖息地。冠蓝鸦的外表非常引人注目,这就有利于人们发现它们,观察它们,观察它们迷人的外表和姿态。
冠蓝鸦从喙至尾体长25-30厘米,重70-100克,翼展34-43厘米,顶冠明显,可受它们心情的影响而升降,当它们兴奋、进功和求偶时,顶冠会高高立起;受到惊吓时,顶冠会如毛刷一般四面张开;而当它们与其他北美洲松鸦一起觅食或休息时,顶冠是平铺在头顶上的。在求偶和飞行中,当它们表示服从时,它们会蹲下并抖松羽毛,并立起顶冠。它们顶冠的羽色为薰衣草蓝或淡蓝色,颈后、翅膀后侧、尾羽内侧和面部为白色。腹部为米白色,颈部有黑色领环,延伸至面部两侧,这些黑色部分的形态有很大的个体差异,有助于冠蓝鸦互相辨认。初级飞羽和尾羽主要为天蓝色,并有明显的黑色和白色线条。喙、腿和眼睛均为黑色。雄鸟和雌鸟外形几乎完全相同,只不过雄鸟体型稍大。它们的喙很强壮,能咬开坚果和橡子,这样就可以吃谷物和种子,不过它们也觅食昆虫,如甲虫、蚱蜢和毛虫
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