Unfortunately, most people speak only of the Jay's hostility and aggressive tendencies.Yes, it's true. Blue Jays are known to raid the nests of other birds and even throw their weight around at the bird feeder. That's how nature stays in balance, right. Blue Jays use their size to maintain dominance over smaller birds, while being watchful of their own predators. Interestingly, a study quelled those beliefs when it found that .01% (6 out of 530) of Blue Jay stomach's contained any evidence of eggs of nestlings.
Now that we've cleared the reputation of Blue Jays just a bit, check out these fascinating Blue Jay facts:
A Blue Jay's crest can reveal it's mood.
When the crest stands proudly, the bird is either feeling stressed or aggressive. They are aptly named. Their scientific name Cyanocitta cristata comes from Greek and Latin meaning: crested, blue chattering bird.
Sing a Song...
Blue Jays make a large variety of noises and calls. They can mimic everything from a squirrel to a squeaky door.
Sing it Loud...
Some of their kin are similarly noisy members of the Corvidae family: crows, magpies and ravens. The Corvidae family has been found in fossils more than 25 million years old.
Sing it Strong...
Blue Jays have strong family ties that contribute to their complex social system. You may hear them scream at predators as they chase them out of the area.
Make it Simple...
When Blue Jays are laying low, they sing a quiet little song.
Similarities to Chipmunks and Squirrels?
Blue Jays love acorns. While chipmunks and squirrels carry nuts in their cheeks, Blue Jays carry their acorns via a pouch in their throat. Like the other critters, they tuck their nuts away for later. Given that each Blue Jay hides approximately 3,000 nuts each fall, and don't collect most of them, Blue Jays have been credited with the growth of oak forests since the last glacial period.
To Last Your Whole Life Long...
Blue Jays can live up to 15 years, and they mate for life. Native to eastern and central North America, Blue Jays are often seen in pairs or in small family flocks.
Sing of Happy...
The jays' bright blue color comes from light refraction caused by the structure of the feathers, not from blue pigment. 
Let the World Sing Along...
Many mysteries surround Blue Jays. Each year thousands of Blue Jay flocks migrate the Atlantic Coast and Great Lakes. Sometimes they migrate north and sometimes south.
Just Sing, Sing a Song.
If you'd like to lure them to your yard, provide them with their favorite food: acorns. Blue Jays prefer to eat from either tray or hopper feeders rather than hanging feeders. They also enjoy peanuts, suet and sunflower seeds, as well as a drink from a bird bath. They also eat small insects like caterpillars, grasshoppers, and beetles.
Oddly, Blue Jays have been caught pecking paint off homes in the Northeast.
Paints have been made with calcium carbonate or limestone, as an extender pigment for hundreds of years. Blue Jays have figured out that this source of calcium is satisfying. Most birds only consume extra calcium during breeding season. It is known that soils in the Northeast are lower in calcium than other regions. Should your home become a tasty source of calcium, you can provide them with another source of calcium.
| How to Provide Eggshells Safely
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Unsterilized eggshells may contain harmful Salmonella bacteria. Before providing eggshells, boil them for 10 minutes or heat them in the oven for 20 minutes at 250° F. Let the eggshells cool, then crush them into pieces smaller than a dime. Offer the eggshells in a dish or on a low platform feeder. Blue Jays sometimes rub ants on their wings.
Known as "anting", while they spread a secretion from ants onto their wings, they often lose their balance and fall over. Theories propose that Blue Jays do this as a way of "cleaning" their feathers or soothing skin irritated by molting, or to repel parasites.
SOURCES and CREDITS:
Wikipedia
http://www.birds.cornell.edu/netcommunity/Page.aspx?pid=1478
http://www.allaboutbirds.org/guide/Blue_Jay/lifehistory
Patuxent Wildlife Research Center longevity records: http://www.pwrc.usgs.gov/bBL/homepage/longvlst.htm
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