There are two striking characteristics about blue jays which draw human attention. Second is the bird's variety of raucous calls and songs which often serve as alarms for other birds when a hawk or a cat or some other predator is in the area. They possess a wide variety of calls, however, and are able to mimic other birds. Chances are if you hear an odd-sounding call in the woods which you can't immediately recognize, it is a blue jay you're listening to. This characteristic does not endure the blue jay to deer and squirrel hunters who always trip the blue jay alarm system when spotted.
Blue jays are also notorious raiders of other birds' nests.
They will attack any bird in the immediate vicinity of their nest in the spring, as well as steal eggs, young birds and even their nests. They like robin nests and often appropriate them for nesting. The bird is omnivorous, meaning they eat everything, but about 75 percent of their diet is vegetable matter. This choice of diet is seasonal, as blue jays prefer insects, salamanders, tree frogs and even mice during warm weather. Their love of acorns should make tree lovers happy, because blue jays commonly bury acorns and never retrieve them.