Woodhouse's Scrub-Jay

About

Woodhouse's Scrub-Jay is a medium-sized, long-tailed songbird native to western North America. It is characterized by its dull blue, gray, and white plumage, lacking the strong contrast and breast band of its close relative, the California Scrub-Jay. Known for its intelligence, caching behavior, and harsh calls, it inhabits arid and semi-arid scrublands and open woodlands.

Size & lifespan

Length

27-31 cm (10.5-12.2 in)

Wingspan

38-43 cm (15-17 in)

Weight

65-95 g (2.3-3.4 oz)

Lifespan

Typically 4-9 years in the wild, with records up to 16 years.

Diet

Omnivore, primarily consuming acorns, pine nuts, seeds, fruits, insects, small vertebrates, and eggs.

Physical characteristics

Plumage

Adults have a dull blue head, wings, and tail, with a grayish-brown back and underparts. The throat is whitish, often streaked with blue, and there is a faint, incomplete grayish-blue breast band or necklace. The belly is off-white to pale gray. The blue coloration is generally duller and less vibrant than in the California Scrub-Jay.

Beak shape

Stout, slightly hooked, and black.

Eye color

Dark brown

Leg color

Black

Distinguishing features

Lack of a distinct white supercilium (eyebrow stripe) and a less defined, duller blue breast band compared to the California Scrub-Jay. The back is typically grayish-brown, contrasting less sharply with the blue head than in other scrub-jay species. The overall impression is duller and grayer.

Juvenile appearance

Juveniles are similar to adults but have duller, grayer plumage overall, with less distinct blue coloration on the head and wings. The head may appear more brownish-gray, and the underparts are often buffier. The bill may also be paler at the base.

Seasonal changes

No significant seasonal plumage changes. Plumage may appear slightly duller when worn before molting.

Sexual dimorphism

Males and females are monomorphic in plumage and size, appearing identical.

How to identify

1. 1

   Plumage Coloration

   Look for the dull blue head, wings, and tail, contrasting with a grayish-brown back and pale gray underparts. The blue is not as bright or intense as in California Scrub-Jays.

2. 2

   Absence of White Supercilium

   A key distinguishing feature from the California Scrub-Jay is the lack of a prominent white eyebrow stripe. There might be a faint pale area, but it's not a distinct stripe.

3. 3

   Breast Band

   Observe the breast band, which is typically faint, incomplete, and grayish-blue, rather than a strong, dark blue necklace.

4. 4

   Habitat

   Consider the habitat. Woodhouse's Scrub-Jay prefers drier, often higher-elevation pinyon-juniper and oak scrublands of the interior West, while California Scrub-Jays are found in coastal and foothill chaparral and oak woodlands.

5. 5

   Vocalizations

   Listen for its harsh, scratchy 'shreeeeenk' or 'jaaaay' calls, which are often less varied and more consistently harsh than those of the California Scrub-Jay.

Habitat & range

Biomes

Arid and semi-arid scrublands, pinyon-juniper woodlands, oak woodlands, chaparral, and riparian areas.

Geographic range

Interior western North America, from eastern Oregon and Idaho south through Nevada, Utah, Arizona, New Mexico, Colorado, western Texas, and into northern Mexico.

Elevation range

Typically found from 900 to 3,000 meters (3,000 to 10,000 feet), but can occur at lower elevations in some areas.

Preferred environments

Areas with scattered oaks, junipers, pinyon pines, and various shrubs that provide both foraging opportunities and cover for nesting and roosting. They often prefer drier, higher-elevation habitats than California Scrub-Jays.

Behavior

Activity time

Diurnal

Feeding habits

Forages primarily on the ground and in shrubs and trees. Known for its extensive caching behavior, burying acorns, pine nuts, and other seeds for later retrieval. Also gleans insects from foliage and bark, and preys on small vertebrates and eggs. Uses its strong bill to crack open nuts and seeds.

Social behavior

Typically seen in pairs or small family groups. Non-migratory and territorial, especially during the breeding season. May form small, loose flocks outside of breeding.

Flight pattern

Strong, direct, and undulating flight with rapid wing beats. Often flies low between trees or shrubs.

Migration pattern

Primarily a resident species throughout its range. Some altitudinal migration may occur in mountainous regions, with birds moving to lower elevations during harsh winter conditions.

Territoriality

Highly territorial, especially during the breeding season. Pairs defend their nesting and foraging areas from other scrub-jays and potential predators. They are known to be aggressive towards intruders.

Breeding & reproduction

Breeding season

Typically from March to July, with peak activity in April and May.

Nesting habits

Nests are built in dense shrubs or small trees, usually 1-5 meters (3-15 feet) above the ground. The nest is a bulky cup made of twigs, rootlets, and plant fibers, lined with finer materials like hair and soft grasses. Both parents participate in nest building.

Clutch size

3-6 eggs, most commonly 4-5.

Egg description

Eggs are typically pale green or bluish-green, heavily marked with brown or olive spots and blotches, often concentrated at the larger end. They measure approximately 28 x 21 mm.

Incubation period

16-19 days, primarily by the female.

Fledging period

18-20 days after hatching. Young remain dependent on parents for several weeks after fledging.

Parental care

Both parents feed and care for the young. The male often feeds the female during incubation. After fledging, both parents continue to feed the young until they become independent.

Where to find

Field tips

1. Listen for Calls. Their harsh, scolding calls are often the first indication of their presence. They are quite vocal, especially when agitated or communicating.
2. Look for Movement in Shrubs. They are active foragers, often hopping on the ground or through dense shrubs. Look for movement in the understory.
3. Observe Caching Behavior. Watch for them burying acorns or other seeds, a common and distinctive behavior.
4. Visit Appropriate Habitats. Focus your search in the specific dry, scrubby, or open woodland habitats they prefer, particularly in the interior western states.
5. Be Patient and Quiet. While often bold, they can also be wary. Patience and quiet observation will increase your chances of a good sighting.

Similar species

Quick facts

Taxonomic Split:

Woodhouse's Scrub-Jay was formerly considered part of a single 'Western Scrub-Jay' species, but was split into Woodhouse's and California Scrub-Jays in 2016 based on genetic and morphological differences.

Food Caching:

Known for its remarkable memory for cached food, often burying thousands of acorns and pine nuts each year.

Intelligence:

Considered one of the most intelligent bird species, capable of complex problem-solving and social learning.

Habitat Preference:

Prefers drier, often higher-elevation habitats compared to the California Scrub-Jay.

Vocalizations:

Characterized by harsh, scratchy calls, generally less varied than those of the California Scrub-Jay.

Fun facts

• Woodhouse's Scrub-Jays are expert at remembering where they've hidden their food, even months later. They can recall the location of thousands of cached items.
• They are known to 're-cache' food if they suspect another bird has seen them bury it, demonstrating a form of tactical deception.
• These jays play an important ecological role in seed dispersal, particularly for oaks and pinyon pines, by burying seeds that are not retrieved.
• The species is named after Samuel Washington Woodhouse, an American physician and naturalist who collected the first specimen in 1849.
• Despite their intelligence, they are often quite wary of humans, especially in less developed areas.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Passeriformes

Family

Corvidae

Genus

Aphelocoma

Species

Aphelocoma woodhouseii

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