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Location: Birds & Bats

Gray Jay (Perisoreus canadensis)



Gray Jay (Perisoreus canadensis)
Order: Passeriformes, Family: Corvidae

Nearctic: Breeding range: The Gray Jay is found from tree line in northern Canada and Alaska south through boreal and subalpine forests to northern California on the west coast, Arizona and New Mexico in the Rocky Mountains, northern Wisconsin in the midwest, and New York in the east. Winter range: The non-breeding range is essentially the same as the breeding range, as the Gray Jay does not migrate except for (in late fall and winter) occasional altitudinal movements in the Rockies and rare latitudinal movements elsewhere, probably due to food shortages. Perisoreus canadensis has never been recorded outside of North America.



I. GEOGRAPHIC RANGE
  • Nearctic: Breeding range: The Gray Jay is found from tree line in northern Canada and Alaska south through boreal and subalpine forests to northern California on the west coast, Arizona and New Mexico in the Rocky Mountains, northern Wisconsin in the midwest, and New York in the east.
  • Winter range: The non-breeding range is essentially the same as the breeding range, as the Gray Jay does not migrate except for (in late fall and winter) occasional altitudinal movements in the Rockies and rare latitudinal movements elsewhere, probably due to food shortages.
  • Perisoreus canadensis has never been recorded outside of North America.
II. PHYSICAL CHARACTERISTICS
  • Often described as resembling an oversized chickadee, P. canadensis is a fluffy, pale-gray, long-tailed, short-billed, crestless jay. Gray Jays, while sexually monomorphic, do show strong regional variation, with three distinguishable populations: Pacific, Rocky Mountain, and Taiga. All adult variations have black eyes, bills, legs, and feet and white auriculars (ear patches) and throats. Pacific birds show extensive dark on the head and brownish-tinged backs. Rocky Mountain birds south of Canada have a whiter head. Taiga birds resemble Pacific birds, but are grayer above and have a grayer (rather than whitish) belly. Juveniles from all populations are sooty overall and gray-billed with white malar stripes.
  • Perisoreus canadensis is 11.5 inches (29 cm) long and has a wingspan of 18 inches (45 cm). Normal adult weight is 2.5 ounces (70 grams).
  • Gray Jays have a clear, pleasant whistle of "wheeeooo" or "wheee-ah." Calls also include a low, husky "chuf-chuf-weef" and a very rough, dry "kreh kreh kreh kreh" alarm call. Like Blue Jays, P. canadensis sometimes sound a screeching "jaaay." Gray Jays are known to mimic sounds.
III. FOOD HABITS
  • Gray Jays are omnivorous, commonly eating arthropods, berries, carrion, eggs, nestling birds, and fungi. Gray Jays use a variety of foraging techniques including flycatching, foliage gleaning, ground gleaning, and even aerial pursuit of rodents. Nestlings are fed partially digested food.
  • One of the most interesting traits of the Gray Jay is its food storage ability. This Jay has unusually large salivary glands that produce copious sticky saliva. They use this saliva to impregnate and encase food, creating a bolus that will adhere to trees. Away from ground scavengers and protected from the wind and snow, these caches allow efficient food hoarding. Gray Jays have been observed making over 1,000 caches in a single 17-hour day. This behavior may be the major adaptation enabling Perisoreus canadensis to occupy the hostile boreal regions during the winter. Fittingly, the genus Perisoreus means "hoarder."
IV. REPRODUCTION
  • Perisoreus canadensis breeds in coniferous forests and sometimes in mixed coniferous-deciduous woodlands. The male chooses a nest site usually in a conifer (spruce or fir), at a height of 5 to 12 feet (1.5-3.6 m), sometimes as high as 30 feet (9.1 m). The male initiates building the nest a thick cup of twigs, bark strips, grass, moss, lichen, and spider webs. The inside is lined with fine grasses, moss, hair, feathers, and fur. The female joins the building over a period of up to 3 weeks or more.
  • The breeding season begins in March, while snow is still on the ground and temperatures are well below freezing, and ends by mid-May. Curiously, second broods are not attempted in ostensibly favorable later months. Three to four eggs (29 X 21 mm) are laid (range 2-5) and incubated by the female alone. The eggs are pale greenish or gray-green and heavily speckled, spotted, or blotched with olive and paler gray. After a 16 to 18 day incubation period, the nestlings hatch slightly downy and altricial. The young are fed by both parents and fledge at 22 to 24 days.
  • Cowbird parasitism has not been observed.
V. BEHAVIOR
  • The Gray Jay is well-known for its bold, almost tame, behavior around humans. In logging camps, at mountain resorts, and at backwoods cabins, the "Camp Robber" or "Whiskey Jack" will brazenly raid campsites or cabins, even taking food from human hands.
  • Juvenile Gray Jays are divided into "stayers" and "leavers:" the dominant brood member expels siblings from the natal territory. At 55 to 65 days old, fledglings fight among themselves for the privilege of staying with the parents outside of the breeding season. The stayers have a better chance of surviving the first summer than leavers, but they do not have a chance to inherit the natal territory. The advantage probably lies in the increased food still stored in the parents' territory.
VI. HABITAT
  • Gray Jays are associated with coniferous and coniferous-deciduous forests of the boreal and sub-alpine vegetative regions. They are most commonly found in spruce and fir woods (with occasional aspens or birch). Despite its association with humans, this jay does not live in towns or developments. It is exclusively a bird of remote forests. In fact, Gray Jays disappear as soon as a camp becomes a permanent settlement.
VII. ECONOMIC IMPORTANCE FOR HUMANS
  • Positive
    Perisoreus canadensis is valuable as an indicator of the health of boreal and sub-alpine systems. Although these areas are less altered than most biomes, acid precipitation and global climate change could have a noticeable effect on this species. Because they are specially adapted to harsh winter environments, Gray Jays may be negatively impacted by warming trends. Thus, the species could serve as an early-warning system for cascading effects of anthropogenic climate change.
  • Negative
    While many corvids can cause extensive crop damage, the Gray Jay, because of its habitat requirements, does not overlap with farms. It can, however, be an annoyance (some would say a great delight) to campers, as it will linger in campsites and attempt to pilfer food.
VIII. CONSERVATION
  • CITES: No special status
  • Perisoreus canadensis is locally common over its wide range, but there is little precise population data. The Breeding Bird Surveys (BBS) from 1966 to 1993 show a -0.6% decline over that period, but with a statistically insignificant sample. The short-term BBS data trend from 1984 to 1993 show a 51.8% increase during that time (P<.01). Gray Jays are very vulnerable to human-set terrestrial fur-bearer traps.
  • The Gray Jay is not listed as Endangered or Threatened in the United States or Canada. No special management measures have been implemented for the species.



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