California scrub-jays: Identification, calls, nesting and the difference from blue jays and Steller's jays

California scrub-jays live in California all year. CDFW's California Wildlife Habitat Relationships account describes the species as a common to very common resident through much of California, missing only from the deserts and the higher elevations. It favors scrub with oaks, chaparral, coastal scrub, oak and riparian woodland and towns, and it is a familiar backyard bird from Northern California to Southern California.

All About Birds even uses "blue jay" as a nickname for it. The true blue jay is a different bird, and the California Bird Records Committee treats it as a rarity in California. The common crested jay of California's mountain forests is the Steller's jay. The California scrub-jay is not listed as threatened or endangered, but it is protected under the federal Migratory Bird Treaty Act and state law.

This guide covers identification, range and season in California, diet and nesting, calls, the blue jay and Steller's jay, legal status and the bird's former name, the western scrub-jay. It is part of our guide to the birds of California.

California scrub-jay at a glance: Key facts for California

Sources: CBRC checklist (September 8, 2026); CDFW CWHR account B348; Cornell Lab of Ornithology, All About Birds; California Fish and Game Code; 50 CFR 10.13.

California scrub-jay identification: A crestless blue jay with a blue necklace:

The California scrub-jay is a fairly large, lanky songbird with a long tail, a hunched posture and a straight, stout bill with a hook at the tip. Cornell Lab of Ornithology's All About Birds gives a length of 11.0 to 11.8 inches, a wingspan of about 15.3 inches and a weight of 2.5 to 3.5 ounces. That makes it bigger than a western bluebird and smaller than an American crow.

Adults are rich blue and gray above, with pale underparts crossed by a blue necklace on the upper breast. Adults also have a darker cheek patch and a thin white line just above the eye. Young birds are gray above, with a blue tail and some blue in the wings. Blue feathers depend on the light, so a scrub-jay in shade can look simply dark.

The rounded head with no crest is the quickest way to separate it from the Steller's jay. Scrub-jays are bold, noisy and curious. They often sit high in a tree or on a wire or post as lookouts, and their flight looks slow, with bursts of flapping between glides.

California scrub-jays in California: Year-round residents of oak woodland, chaparral and towns:

CWHR describes the California scrub-jay as a year-round resident through much of California. It is most at home in scrub with oaks and also lives in chaparral, coastal scrub, oak and other hardwood woodland, mixed hardwood-conifer woodland, valley and foothill riparian woodland, pinyon-juniper and towns. The account says it is common in residential areas. All About Birds adds that it generally uses lower, drier habitats than the Steller's jay.

The bird does not migrate, though it does move locally. CWHR says some birds move upslope after breeding in the lower mountains, and the species turns up irregularly in desert areas and along the Colorado River in fall and winter.

California scrub-jay name: Formerly the western scrub-jay:

CWHR still files the species under its old name, western scrub-jay. All About Birds says the California scrub-jay and Woodhouse's scrub-jay were treated as one species until 2016. Both are now on the official state list, along with the island scrub-jay. CWHR notes that the island scrub-jay, which lives on Santa Cruz Island, was once considered part of the same species and was raised to a full species in 1995. The checklist lists this bird as California Scrub-Jay, Aphelocoma californica.

California scrub-jay habitat, diet and nesting: Acorns, buried caches and twig nests:

California scrub-jays eat almost anything. CWHR lists acorns, nuts, seeds, fruits, insects and other invertebrates, as well as small vertebrates and the eggs and young of other birds. They pick food from the ground, leaves, bark and wood, and they hammer nuts open with the hooked bill. They often bury nuts and other food in the soil to eat later. CWHR describes the species as closely tied to oaks and acorns, and it notes that scrub-jays steal from the stored acorns of acorn woodpeckers.

All About Birds adds that some scrub-jays steal acorns they have watched other jays hide, and that a jay burying its own acorn first checks that no other jay is watching. CWHR also says drinking water is probably essential.

Breeding runs from early March to mid-August. Both members of a pair build the nest, a cup of twigs and grasses lined with rootlets and plant fibers. It is usually set in dense foliage of a tree or shrub 3 to 30 feet up, often near water. The female lays two to six eggs and incubates them alone for 15 to 18 days while the male brings her food. Both parents feed the young, which leave the nest at 18 to 23 days. In coastal California, pairs hold territories of about 7.5 acres and defend them all year.

California scrub-jay calls and sounds: Many call types and a quiet courtship song:

Scrub-jays are loud and talkative. All About Birds says researchers have described more than 20 call types for this species and the closely related Woodhouse's scrub-jay. They include a "weep" given in flight, while carrying nest material or when taking cover from a flying predator; a bell-like "shlenk" used in fights; a quiet "kuk" passed between mates; and loud, rasping scolds aimed at predators.

The song is much quieter. Both males and females sing a soft medley of sweet notes that can last up to five minutes, usually only during courtship and when the pair is close together. Recordings of the calls and song are on the All About Birds sound page.

Blue jays in California: A rare visitor, while the Steller's jay is California's common crested jay:

The blue jay, Cyanocitta cristata, is on the official California list, but only as a review species. The CBRC asks for documentation of every California sighting of a review species, and it says review species in general average four or fewer occurrences a year in California over the most recent 10 years. All About Birds describes the blue jay as a crested bird of blue, white and black, and its Steller's jay page notes that the blue jay is expanding westward.

The Steller's jay, Cyanocitta stelleri, is the blue jay's relative in the same genus and a regular California species. CDFW's Steller's jay account calls it a common, year-round resident of forests in the mountains and foothills throughout California. It lives in most conifer and hardwood forests, moves downslope from high elevations in winter and is rare in the Central Valley and the southern coastal lowlands in winter.

According to All About Birds, the Steller's jay has a tall, triangular crest, a charcoal-black head and a blue body with no white underparts. The Steller's jay pages place it in evergreen forests, typically between about 3,000 and 10,000 feet and lower near the Pacific coast, and also in campgrounds, parks and backyards. The California scrub-jay has no crest and shows pale underparts. All About Birds notes that the Steller's jay and blue jay are the only North American jays with crests and that the two occasionally interbreed where their ranges meet.

Across most of California, then, a blue, crestless jay in a yard or oak woodland is a California scrub-jay, and a dark, crested jay in the mountain forests is a Steller's jay.

California scrub-jay legal status in California: A protected nongame bird:

The California scrub-jay is not listed as endangered or threatened, is not fully protected and is not a game bird. Three overlapping laws protect it.

• Nongame bird. Fish and Game Code section 3800 defines every naturally occurring bird that is not a game bird or fully protected as a nongame bird and makes it unlawful to take one except as the code or Fish and Game Commission rules allow.
• Nests and eggs. Section 3503 makes it unlawful to take, possess or needlessly destroy the nest or eggs of any bird except as the code allows.
• Migratory birds. The California scrub-jay is on the federal Migratory Bird Treaty Act list in 50 CFR 10.13. Section 3513 makes it unlawful under state law to take or possess any bird on that list except as federal rules allow.

California scrub-jay: A familiar lowland jay found year-round:

The California scrub-jay is the blue, crestless jay of California's lowlands, a year-round resident of oak woodland, chaparral and towns across most of California. Its rounded head, blue necklace and noisy calls set it apart. The true blue jay remains a rarity in California, and the crested Steller's jay belongs to the mountain and foothill forests. The California scrub-jay and its nests are protected under state and federal law. Our guides to the house finch and mourning dove cover two more familiar backyard birds.