The Blue Jay Cyanocitta cristata is a little larger than an American Robin, about 30 cm in length from the tip of its bill to the tip of its tail. A white-faced bird with a blue crest, back, wings, and tail, it is strongly marked with black and white. Male and female Blue Jays are very similar in appearance. The crest, an elongated crown of feathers found in many jays, is raised or lowered according to the bird’s mood. In moments of high excitement and aggression the crest may be fully erected, forming a prominent peak.