Photo: Kirk Waln/USFWS

Island Scrub-Jay

Aphelocoma insularis

Larger, darker, and more richly colored than the Western Scrub-Jay is this very localized species. It lives only on Santa Cruz Island, a little over 20 miles long and up to five miles wide in places, one of the Channel Islands off the coast of southern California.
Conservation status Total population estimated at about 12,500. Reasonably secure as long as island habitat is protected.
Family Crows, Magpies, Jays
Habitat Mostly oak woodland and chaparral. Its major habitats on Santa Cruz Island consist of low chaparral dominated by island scrub oak and woodlands dominated by other species of oaks. As with many kinds of island birds, however, it is adaptable, taking advantage of other habitats such as pine woods and streamside thickets.
Larger, darker, and more richly colored than the Western Scrub-Jay is this very localized species. It lives only on Santa Cruz Island, a little over 20 miles long and up to five miles wide in places, one of the Channel Islands off the coast of southern California.
Photo Gallery
Feeding Behavior

Forages on the ground and in trees, sometimes in flocks. Often harvests acorns and buries them, to retrieve and eat them later.


Eggs

3-4, sometimes 2-5. Light bluish green, spotted faintly with olive. Incubation is by female, about 18 days. Young: Fed by both parents. Age at first flight is not well known. 1 brood per year.


Young

Fed by both parents. Age at first flight is not well known. 1 brood per year.

Diet

Omnivorous. Diet varies with season. Eats a wide variety of insects and other arthropods. Feeds heavily on acorns, especially in fall, as well as other seeds and berries. Also eats small lizards, snakes, mice, and the eggs and young of smaller birds.


Nesting

Unlike Florida Scrub-Jay and Mexican Jay, this species breeds in isolated pairs, not in cooperative flocks. Nest site is in tree or shrub, usually an oak, typically 6-10 feet above the ground but sometimes much higher. Nest (built by both sexes) is a bulky, thick-walled cup of twigs, lined with fine rootlets and sometimes with animal hair.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Illustration © David Allen Sibley.
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Migration

Permanent resident, not known to stray away from Santa Cruz Island.

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Migration

Permanent resident, not known to stray away from Santa Cruz Island.

Songs and Calls
No advertising song; vocalizations similar to those of Western Scrub-Jay, although generally louder and harsher than among mainland birds. Most common calls a harsh shek-shek-shek or rising shreeenk.