Feeding Behavior

Forages in trees and shrubs and on ground. Comes to feeders for seeds or suet. Pounds on hard nuts or seeds with bill to break them open. Will harvest acorns and store them in holes in ground.

Eggs

4-5, sometimes 3-7. Greenish or buff, sometimes pale blue, spotted with brown and gray. Incubation is by both parents (but female does more), about 16-18 days. Young: Both parents bring food for nestlings. Young leave nest 17-21 days after hatching.

Young

Both parents bring food for nestlings. Young leave nest 17-21 days after hatching.

Diet

Omnivorous. Most of diet is vegetable matter (up to 75% of diet for year, higher percentage in winter), including acorns, beechnuts, and other nuts, many kinds of seeds, grain, berries, small fruits, sometimes cultivated fruits. Eats many insects, especially caterpillars, beetles, grasshoppers, and others; also eats spiders, snails, birds' eggs, sometimes small rodents, frogs, baby birds, carrion, other items.

Nesting

Courtship may involve aerial chases; male may feed female. Blue Jays become quiet and inconspicuous around the nest, but will attack with loud calls if the nest is threatened by a predator. Nest site is in tree (either coniferous or deciduous), placed in vertical crotch of trunk or at horizontal fork in limb well out from trunk; usually 8-30' above ground, sometimes 5-50' up. Nest (built by both sexes) is a bulky open cup made of twigs, grass, weeds, bark strips, moss, sometimes held together with mud. Nest is lined with rootlets and other fine materials, often decorated with paper, rags, string, or other debris.