Animal
Blue jay
The blue jay is a noisy blue and white bird with a crest. It loves acorns and hides them to eat later.
The blue jay is a large, crested songbird of eastern and central North America, blue above and white below with a black necklace. It is clever and loud, can copy the calls of hawks, and can bury thousands of acorns in a single fall. Its acorn burying is credited with helping oak trees spread.
Cyanocitta cristata is a corvid (crow family) of eastern and central North America, known for intelligence, close family bonds and a huge vocal repertoire that includes accurate hawk mimicry. Its caching of acorns is credited with spreading oaks after the last glacial period, and its partial migration remains poorly understood.
Photo: Darren Swim, CC BY-SA 3.0, via Wikimedia Commons
Meet the blue jay
The blue jay is a big, noisy bird.
Its back, wings and tail are blue. Its tummy is white. It has a pointy crest and a black necklace.
The blue jay is a large songbird, 25 to 30 centimeters long: bigger than an American robin and smaller than a crow. Adults are blue above and white or light gray below, with a pointed crest, a black necklace, black bars on the wings and tail and bold white wing patches and tail corners.
Here is a surprise: blue jay feathers do not contain blue color. The pigment is brown. The feathers look blue because tiny structures on them scatter light.
Cyanocitta cristata is a member of the crow family (Corvidae), 25 to 30 centimeters long with a wingspan of 34 to 43 centimeters and a mass of 70 to 100 grams; Audubon notes that males are slightly larger. Adults are blue above and white to light gray below, with a black necklace and bridle, black barring on wings and tail and white wing bars and tail corners.
The feather pigment is melanin, which is brown; the blue is a structural color produced by light scattering in modified cells on the surface of the feather barbs. The black bridle varies a great deal between individuals and may help jays recognize one another.
Quick facts
- Group
- Bird
- Length
- 0.25 to 0.3 m
- Wingspan
- 0.34 to 0.43 m
- Weight
- 0.07 to 0.1 kg
Where it lives
Blue jays live in North America.
They like woods with oak trees. They also live in towns, parks and backyards.
Blue jays live across the eastern and central United States and in Canada. They live in many kinds of forest, especially near oak trees, and are more common at forest edges than deep in the woods. Many live in towns, cities and parks with oaks or bird feeders.
Most blue jays stay in the same area all year, but some migrate. Thousands fly south together along the Great Lakes and the Atlantic coast in fall, though not farther south than the United States.
IUCN's 2025 global assessment lists the United States as breeding range, Saint Pierre and Miquelon as resident, Canada only as passage and Mexico with uncertain seasonality. Audubon's range regions include eastern and western Canada, and it says jays are present all year in most of their range, so this map shows the United States and Canada and leaves Mexico off. Audubon describes breeding in deciduous or mixed woods, avoiding purely coniferous forest, and favoring oak or beech; the species is common in well-wooded suburbs and city parks and has been expanding toward the northwest.
Migration is partial: Cornell estimates that probably fewer than 20 percent of jays migrate, and some individuals migrate one year but not the next. Large flocks pass the Great Lakes and Atlantic coast, yet Cornell notes that no one has worked out why they migrate when they do.
Continent
Its habitat
Where can you find this animal?
- Lives here naturally · Countries and seas named by a scientific source
- Sightings recorded · Records of wild sightings (GBIF)
Lives here naturally · Countries and seas named by a scientific source
Oak and mixed woods, forest edges, suburbs and city parks in the eastern and central United States and in Canada. Some birds migrate, but not south of the United States.
Places: United States and Canada.
Source: iucn-red-list · checked October 2026
Sightings recorded · Records of wild sightings (GBIF)
Counts of GBIF records of wild observations (human and machine) and preserved specimens. Records include introduced populations, vagrants, escaped or released animals and misidentifications, so a country with records is not necessarily part of the native range.
Wild sightings have been recorded in United States, Canada, UK, Costa Rica, Spain, Greece, Mexico, Puerto Rico and 3 more places.
Source: gbif · checked October 2026
Range maps show where scientists say an animal lives, often country by country. An animal may live in only part of a country shown, and sightings records can include animals that wandered far from home.
Acorn planters
Blue jays love acorns.
They bury acorns in the ground to eat later. Buried acorns can grow into new oak trees!
Blue jays eat acorns, nuts, seeds, grain and fruit, plus insects such as caterpillars, beetles and grasshoppers. To open a hard nut, a jay holds it in its feet and pecks it open.
In fall they store food for later. A jay can carry five acorns at once: two or three in a pouch in its throat, one in its mouth and one in the tip of its bill. In one study, six jays each hid 3,000 to 5,000 acorns in a single autumn. Scientists credit this habit with helping oak forests spread after the last ice age.
Blue jays are omnivores. Cornell reports that stomach contents over a year were about 22 percent insects, with acorns, nuts, fruits and grains making up almost all the rest; Audubon gives vegetable matter as up to 75 percent of the annual diet. Although jays do raid nests, traces of eggs or nestlings appeared in only 6 of 530 stomachs examined.
Food is carried in a gular pouch in the throat and upper esophagus: up to five acorns at a time. Six radio-tagged jays each cached 3,000 to 5,000 acorns in one autumn. Their accuracy in choosing acorns not infested by weevils, and burying them, is credited with spreading oaks after the last glacial period.
A crest that talks
A blue jay's crest goes up and down.
Up means 'I am cross!' Down means 'I feel calm.' Blue jays hold nuts with their feet.
A blue jay uses its crest to show how it feels. When it is calm, with its mate or family, the crest lies down. The more aggressive it feels, the higher the crest goes, and when a jay squawks, the crest is almost always raised.
Jays have strong bills for pounding open hard nuts and seeds, and they grip food with their feet while they work. In flight, look for their rounded wings, long tail, white underside and big white tail corners.
The crest is a signal of aggression: held low when incubating, feeding nestlings or with mates and flock members, and raised higher as aggression rises; a squawking jay almost always has its crest up. Cornell notes that jays lower their crests when feeding peacefully with family.
The stout bill hammers open nuts held in the feet. In flight jays show rounded wings, a broad, rounded tail and prominent white tail corners. Wild blue jays have never been reported using tools, but Cornell notes that captive jays used strips of newspaper to rake in food pellets.
Growing up
Mom and Dad blue jay build a nest of twigs together.
Mom sits on the eggs. Dad brings her food. Baby jays leave the nest after about three weeks.
Blue jays often mate for life. The pair builds a cup nest of twigs, grass and sometimes mud in a tree, usually 3 to 8 meters up, and line it with fine roots. The female lays two to seven spotted eggs and keeps them warm for 17 to 18 days while the male brings her food.
The chicks hatch naked and helpless, with red mouths. They leave the nest at 17 to 21 days old, but their parents keep feeding them for one to two months more.
Pairs often mate for life and stay together year-round. Both sexes gather material and build, the male gathering more and the female building more; Cornell notes jays may fly long distances for fresh rootlets from newly dug ditches or fallen trees. Clutches are two to seven bluish or light brown spotted eggs.
Cornell reports that only the female incubates, for 17 to 18 days, fed entirely by her mate, and that she broods the nestlings for their first 8 to 12 days. The brood usually fledges together at 17 to 21 days, and young stay with their parents for at least a month, sometimes two. The oldest known wild blue jay was at least 26 years 11 months old.
Loud, clever copycats
Blue jays make lots of sounds.
They shout 'jay, jay!' They can even sound like a hawk!
Blue jays have a huge 'vocabulary' of calls, from a loud 'jay! jay!' to musical 'queedle' notes. They are excellent mimics too. In the wild they often copy the screams of red-shouldered and red-tailed hawks, maybe to warn other jays that a hawk is near, or to trick other birds.
Captive blue jays have even learned to imitate human speech and meowing cats. Jays live in close family groups and are known for their intelligence.
The vocal repertoire is immense, and blue jays are excellent mimics, especially of red-shouldered and red-tailed hawks. Cornell suggests hawk calls may tell other jays a hawk is around or deceive other species; jays sometimes give them when approaching feeders, which may scatter other birds, though most quickly return.
Despite their reputation for aggression, Cornell notes jays are less aggressive than many species: in a Florida study, red-bellied and red-headed woodpeckers, Florida scrub-jays, common grackles and gray squirrels strongly dominated them at feeders. Captive jays have learned to imitate human speech and meowing cats.
Did you know?
One wild blue jay lived for almost 27 years.
The oldest known wild blue jay was at least 26 years and 11 months old.
A jay banded in 1989 in the Newfoundland and Labrador region was found there in 2016, at least 26 years 11 months old.
Is it in danger?
There are lots of blue jays.
They are not in danger. But pet cats and dogs can hurt them.
Blue jays are common, and the IUCN Red List rates them Least Concern. Partners in Flight estimated in 2020 that about 17 million breed.
Even so, their numbers have slowly fallen, by about a quarter between 1966 and 2019. Cornell says the most common cause of death linked to people is attacks by cats and dogs. Young jays sometimes wander from the nest a few days before they fledge, and people think they are abandoned. Put back near the nest, they are fed again by their parents.
The global assessment (IUCN, 2025) lists Cyanocitta cristata as Least Concern. The North American Breeding Bird Survey estimates a decline of about 0.6 percent a year, a cumulative 27 percent from 1966 to 2019, and Partners in Flight (2020) estimates a global breeding population of 17 million, with a Continental Concern Score of 9 out of 20.
Cornell identifies attacks by cats and dogs as the most frequent human-associated cause of death. It also notes that some nestlings wander from the nest a few days before fledging and are mistaken for abandoned babies; placed back near the nest, they are fed again by their parents.
IUCN Red List
How is the blue jay doing in the wild?
- Least Concern (this animal)
- Near Threatened
- Vulnerable
- Endangered
- Critically Endangered
- Extinct in the Wild
- Extinct
Least Concern
Not at risk of disappearing from the wild right now.
See the IUCN Red List assessment · The IUCN Red List of Threatened Species 2021.3
Amazing facts
-
Blue jay feathers are not really blue inside.
The color in blue jay feathers is brown. They look blue because of the way tiny feather structures scatter light.
The pigment is brown melanin; the blue is structural, caused by light scattering in modified cells of the feather barbs.
-
Blue jays can copy a hawk's scream.
Blue jays often copy the calls of red-shouldered hawks, which may warn other jays or fool other birds.
Hawk mimicry, especially of the red-shouldered hawk, may signal a predator to other jays or deceive other species.
-
One wild blue jay lived for almost 27 years.
The oldest known wild blue jay was at least 26 years and 11 months old.
A jay banded in 1989 in the Newfoundland and Labrador region was found there in 2016, at least 26 years 11 months old.
-
Blue jays may have helped oak trees spread.
By choosing and burying acorns, blue jays are credited with helping oak forests spread after the last ice age.
Their selection and burial of weevil-free acorns is credited with spreading oaks after the last glacial period.
Words to know
- crest
- a tuft of feathers on top of a bird's head
- mimic
- to copy the sound or look of something else
- cache
- to hide food to eat later; also the hidden food itself
- fledgling
- a young bird that has just left the nest
- omnivore
- an animal that eats both plants and animals
- acorn
- the nut of an oak tree
Discovery challenge
-
What makes a blue jay look blue?
Why do blue jay feathers look blue?
What produces the blue color of blue jay feathers?
- Light scattering in the feathers
- Blue paint-like pigment
- Eating blueberries
Show the answer
Light scattering in the feathers
The feathers bend the light so they look blue.
The pigment is brown; tiny feather structures scatter light so they look blue.
Structural color from light scattering in modified cells of the barbs; the pigment is brown melanin.
-
What does a blue jay hide in the ground?
What food do blue jays bury by the thousand?
Which food's caching by blue jays is credited with spreading a kind of tree?
- Acorns
- Fish
- Pebbles
Show the answer
Acorns
Blue jays hide acorns.
They bury thousands of acorns in the fall.
Acorns: their caching is credited with spreading oaks after the last glacial period.
-
What sound can a blue jay copy?
Which bird's call do blue jays often copy?
Which kind of bird do blue jays most often mimic?
- A hawk
- A duck
- An owl
Show the answer
A hawk
Blue jays can sound like a hawk.
They often copy red-shouldered and red-tailed hawks.
Especially the red-shouldered hawk, and also the red-tailed hawk.
-
What does a jay's raised crest mean?
What does it mean when a blue jay raises its crest?
What does crest height signal in blue jays?
- It is feeling cross
- It is sleepy
- It is cold
Show the answer
It is feeling cross
A raised crest means the jay is feeling cross.
The higher the crest, the more aggressive the jay is feeling.
Aggression: the crest is lowered with mates and family and raised when squawking.
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For parents & teachers
What children will learn
- Describe the blue jay and explain that its blue is a structural color.
- Explain how blue jays carry and cache acorns and how that helps oak forests.
- Describe the blue jay's family life, including how long parents feed their young.
- Describe the jay's calls, mimicry and crest signals.
Recommended ages: 3 to 17 · About 15 minutes
Talk about it
- Why might a blue jay copy a hawk's call?
- How could a bird burying acorns help a forest grow?
- What should you do if you find a young bird hopping on the ground?
Try at home or in class
- Hide ten acorns or nuts in a yard, wait a day, and see how many you can find again.
- Look at a bird feather or a soap bubble in sunlight and notice how color can come from light, not paint.
Key vocabulary: crest, mimic, cache, fledgling, omnivore, acorn
Where these facts come from
- The IUCN Red List of Threatened Species , International Union for Conservation of Nature (IUCN terms of use (no redistribution of Red List data or range maps))
- GBIF Backbone Taxonomy and GBIF Occurrence Search , Global Biodiversity Information Facility (CC0 1.0 (backbone); occurrence counts are facts derived from records under CC0, CC BY and CC BY-NC)
- Wikidata , Wikimedia Foundation (CC0 1.0)
- Cyanocitta cristata (Blue Jay), Red List assessment 2025 , IUCN Red List of Threatened Species
- Blue Jay overview , Cornell Lab of Ornithology, All About Birds
- Blue Jay life history , Cornell Lab of Ornithology, All About Birds
- Blue Jay identification , Cornell Lab of Ornithology, All About Birds
- Blue Jay , National Audubon Society, Guide to North American Birds
- Wikimedia Commons , Wikimedia Foundation (Per file: Public domain, CC0, CC BY or CC BY-SA only (credited on each page))
Checked, not yet human-reviewed. Last updated October 24, 2026. Spotted a mistake? Tell us.