How to identify the Woodhouse's Scrub-Jay

To correctly identify the Woodhouse's Scrub-Jay (Aphelocoma woodhouseii), check each of these features. Birds can be tricky: habit, habitat, and call often confirm a sighting that a single photo cannot.

Size at a glance

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)

Physical features to check

1. 1

   Plumage

   Overall feather coloration and pattern.

   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.

2. 2

   Beak shape

   Shape and color of the bill: a key field mark.

   Stout, slightly hooked, and black.

3. 3

   Eye color

   Iris color and any distinctive eye markings.

   Dark brown

4. 4

   Leg color

   Leg and foot color.

   Black

5. 5

   Distinguishing features

   Standout features that separate this species.

   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.

6. 6

   Juvenile appearance

   How young birds differ from adults.

   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.

7. 7

   Seasonal changes

   Plumage variation between breeding and non-breeding seasons.

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

8. 8

   Sexual dimorphism

   How males and females differ.

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

Key field marks

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

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