This is a common large songbird known to many people. Blue above and white below,with a prominent crest and a bold black necklace. The wings and tail are barred with black, and it has a bold white wing bar. The black bridle across the face, nape, and throat varies extensively and may help Blue Jays recognize one another. Usually 6-7 inches in size.
Their fondness for acorns is credited with helping spread oak trees after the last glacial period.
Thousands of Blue Jays migrate in flocks along the Great Lakes and Atlantic coasts, but much about their migration remains a mystery. Some are present throughout winter in all parts of their range. Young jays may be more likely to migrate than adults, but many adults also migrate. Some individual jays migrate south one year, stay north the next winter, and then migrate south again the next year. No one has worked out why they migrate when they do.
Blue Jays prefer tray feeders or hopper feeders on a post rather than hanging feeders, and they prefer peanuts, sunflower seeds, and suet. Planting oak trees will make acorns available for jays of the future. Blue Jays often take drinks from birdbaths.
The Blue Jay frequently mimics the calls of hawks, especially the Red-shouldered Hawk. These calls may provide information to other jays that a hawk is around, or may be used to deceive other species into believing a hawk is present. Blue Jay song
Blue Jays build their nests in the crotch or thick outer branches of a deciduous or coniferous tree, usually 10-25 feet above the ground. Male and female both gather materials and build the nest, but on average male does more gathering and female more building. Twigs used in outer part of nest are usually taken from live trees, and birds often struggle to break them off. Birds may fly great distances to obtain rootlets from recently dug ditches, fresh graves in cemeteries, and newly fallen trees. Jays may abandon their nest after detecting a nearby predator. Clutch size 2-7 eggs, and only the female incubates the eggs. The male will provide food and nesting materials. Blue jays will mate for life.
Blue Jays are disliked by many people for their aggressive ways, but they are far less aggressive than many other species. In one Florida study, Red-bellied Woodpeckers, Red-headed Woodpeckers, Florida Scrub-Jays, Common Grackles, and gray squirrels strongly dominates Blue Jays at feeders, often preventing them from obtaining food, and Northern Bobwhites, Mourning Doves, White-winged Doves, Northern Mockingbirds, and Northern Cardinals occasionally dominated them as well.
Blue Jays are common, but their populations have declined by an estimated 0.6% per year for a cumulative decline of about 27% between 1966 and 2019 according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 17 million. The species rates 9 out of 20 on the Continental Concern Score indicating a species of low conservation concern. The most frequent cause of death that is associated with humans comes from attacks by cats and dogs.
For more information about blue jays see All about birds website.
Article submitted by: Melanie Jerome
Photographs provided by: Charles Moore & Ed Konrad
This blog post is part of a series SIB will publish on a regular basis to feature birds seen in the area, both migratory and permanent residents. When possible we will use photographs taken by our members. Please let us know if you have any special requests of birds you would like to learn more about.