Dark Blue Jay vs California Scrub-Jay

Dark Blue Jay

Cyanocorax

How to recognise a dark blue jay?

General appearance

Dark Blue Jays encompass deep blue to purplish-blue plumage with a strong black barring on their tail and wings. The throat, chin and upper breast showcases lighter blue shades with traces of grayish white. Their stout, robust build, black beak and feet, and an average length of 11-12 inches are conspicuous traits.

Male vs female

Sexual dimorphism isn't prominent in Dark Blue Jays, making it hard to distinguish between males and females. Both share identical color patterns and physical traits, females might be slightly smaller in size. Behavioral indications during breeding season might assist in discernment.

Juvenile

Juvenile Dark Blue Jays possess a duller coloration compared to adults until they complete their first molt. The immature birds have lighter blue to gray fluff with less distinct barring on tails and wings. The juvenile's eyes, initially a subtle blue-gray, brighten to a more pronounced white as they mature.

Size

9.8 - 15.7 in/2.3 - 9.6 oz

Habitat

Primary habitat

The dark blue jay predominantly resides in temperate forests and woodlands in North America, specifically the Pacific Northwest region.

Additional range

Unexpectedly, this bird species effectively adapts to urban and suburban environments, provided there are sufficient trees for nesting and adequate food sources.

Range Map

What do dark blue jays like to eat?

Natural diet

The dark blue jay primarily feeds on a variety of natural foods. It consumes insects, such as beetles and caterpillars, which provide necessary protein. Additionally, it eats fruits and berries from trees and shrubs, providing essential vitamins. Seeds and nuts are also part of its diet, offering vital energy and fats. Occasionally, the dark blue jay may eat small amphibians and eggs from other birds' nests when available. This diverse diet ensures a balanced intake of nutrients required for its survival in various environments.

Bird feeders

At bird feeders, the dark blue jay often consumes common offerings like sunflower seeds, peanuts, and corn. It may also partake in suet cakes, which provide high-energy content necessary for colder months. The bird shows a preference for larger seeds and nuts, cracking them open with its strong beak. Occasionally, the dark blue jay will sample other grains and seeds mixed into commercial bird feed blends, though it typically searches for its preferred high-nutrient options. Its versatile diet allows it to adapt to various feeder types, ensuring it's well-fed even in urban settings.

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California Scrub-Jay

Aphelocoma californica

How to recognise a California scrub-Jay?

General appearance

A California scrub-jay is an avian species about the size of a crow or robin, with an impressive wingspan measuring between 28-33 cm. It has a unique coloration pattern, including a white throat framed by a streaked necklace. The bird's back is gray, contrastingly offset by a bold blue head, wings, and tail. Moreover, its tail is distinctive, showcasing a long, rounded, and wedge-shaped figure.

Male vs female

Sexual dimorphism is limited in the California scrub-jay, making it challenging to differentiate males from females based on colour or size alone. Both genders display similar plumage and size. Detailed behavioral observations may be required to accurately distinguish between the two.

Juvenile

Juvenile California scrub-jays exhibit similar coloration to their adult counterparts, although they may have a more dull and less distinctive plumage. They experience a transition to their classic coloration, with the blue becoming much more vivid as they mature into adulthood.

Size

11.0 - 11.8 in/2.5 - 3.5 oz

Habitat

Primary habitat

The California scrub-jay is typically found in oak woodland, oak scrub, and foothill forests of pinyon pine. These environments provide plenty of cover and abundant food sources.

Additional range

In addition to natural habitats, the California scrub-jay has adapted to human environments. It is often seen in well-wooded suburbs and parks, and also finds riverside woods suitable.

Range Map

What do California scrub-jays like to eat?

Natural diet

The California scrub-jay is omnivorous, with its diet changing seasonally. In summer, it consumes a wide range of insects, moth caterpillars, a few spiders, and snails, important for feeding young jays. During winter, its diet shifts to mostly acorns, seeds, nuts, and berries. It also eats some rodents, eggs and young birds, and small reptiles and amphibians, adjusting its food intake based on availability.

Bird feeders

At bird feeders, the California scrub-jay typically consumes available seeds and nuts. They are particularly attracted to peanuts, sunflower seeds, and suet. Their adaptable foraging helps them take advantage of food supplies offered by humans in residential areas.

What does a California scrub-Jay sound like?

The California scrub-jay possesses a loud and throaty voice that is often described as sounding like "jayy" or "jree." Its flight is accompanied by a long, rhythmic series of "check-check-check" notes. The bird's call pattern can be flat or rising in tone, producing sounds that are distinctively buzz-like, rattle-like, raucous, or trill-like in nature. Therefore, its vocalizations are quite distinct and varied, providing a unique acoustic presence in its environment.

Call

Audio by Jonathon Jongsma

/ CC BY-SA 3.0

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Dark Blue Jay

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California Scrub-Jay

Dark Blue Jay

Cyanocorax

General appearance

Dark Blue Jays encompass deep blue to purplish-blue plumage with a strong black barring on their tail and wings. The throat, chin and upper breast showcases lighter blue shades with traces of grayish white. Their stout, robust build, black beak and feet, and an average length of 11-12 inches are conspicuous traits.

Male vs female

Sexual dimorphism isn't prominent in Dark Blue Jays, making it hard to distinguish between males and females. Both share identical color patterns and physical traits, females might be slightly smaller in size. Behavioral indications during breeding season might assist in discernment.

Juvenile

Juvenile Dark Blue Jays possess a duller coloration compared to adults until they complete their first molt. The immature birds have lighter blue to gray fluff with less distinct barring on tails and wings. The juvenile's eyes, initially a subtle blue-gray, brighten to a more pronounced white as they mature.

Size

9.8 - 15.7 in/2.3 - 9.6 oz

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California Scrub-Jay

Aphelocoma californica

General appearance

A California scrub-jay is an avian species about the size of a crow or robin, with an impressive wingspan measuring between 28-33 cm. It has a unique coloration pattern, including a white throat framed by a streaked necklace. The bird's back is gray, contrastingly offset by a bold blue head, wings, and tail. Moreover, its tail is distinctive, showcasing a long, rounded, and wedge-shaped figure.

Male vs female

Sexual dimorphism is limited in the California scrub-jay, making it challenging to differentiate males from females based on colour or size alone. Both genders display similar plumage and size. Detailed behavioral observations may be required to accurately distinguish between the two.

Juvenile

Juvenile California scrub-jays exhibit similar coloration to their adult counterparts, although they may have a more dull and less distinctive plumage. They experience a transition to their classic coloration, with the blue becoming much more vivid as they mature into adulthood.

Size

11.0 - 11.8 in/2.5 - 3.5 oz

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How to tell the Dark Blue Jay from the California Scrub-Jay

Visual differences

The Dark Blue Jay, averaging 11-12 inches, has deep blue to purplish-blue plumage with black barring on the tail and wings, a black beak, and robust build. In contrast, the California Scrub-Jay measures 11-12 inches with a blue head, wings, and tail, a gray back, and a white throat with a necklace pattern. Its tail is long and wedge-shaped. The Dark Blue Jay's plumage is generally darker, with more pronounced black accents than the Scrub-Jay's lighter and more varied blue-gray pattern. Both species lack significant sexual dimorphism in size or color.

Key differences and behavior

The Dark Blue Jay and the California Scrub-Jay diverge significantly in behavior and habitat preferences. Dark Blue Jays are highly social, forming flocks for lively interactions and intricate courtship dances, while California Scrub-Jays maintain monogamous, year-round pair bonds. Dark Blue Jays adapt well to urban settings with their diverse diet of insects, fruits, and seeds, thriving in the Pacific Northwest. Conversely, California Scrub-Jays favor oak woodlands and parklands in California, exhibiting intelligent behaviors like holding "funerals" for deceased jays. While both species visit bird feeders for seeds and nuts, Dark Blue Jays lean towards larger offerings, and California Scrub-Jays showcase adaptive foraging strategies.