The blue jay is between 9 and 12 inches long. It is bright blue on top and white to gray on its throat, chest and belly. It has a gray-blue crest on its head and black and white bars on its wings and tail. Its bill, legs and feet are black. It also has a black "necklace" on its lower throat.The blue jay is very aggressive and territorial. Groups of blue jays often attack intruders and predators. They often drive other birds away from bird feeders. The blue jay is also very vocal. It makes a number of different calls including its distinctive "jay- jay." It also growls, whistles and chatters.
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