Green jay
| Green jay | |
|---|---|
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| A green jay in Texas | |
| Scientific classification | |
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| Species: | C. yncas
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| Binomial name | |
| Cyanocorax yncas (Boddaert, 1783)
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| Synonyms | |
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Xanthoura luxuosa | |
The green jay (Cyanocorax yncas) is a bird species of the New World jays, and is found in both North and South America. Adults are about 27 cm (11 in) long and variable in colour across their range; they usually have blue and black heads, green wings and mantle, bluish-green tails, black bills, yellow or brown eye rings, and dark legs. The basic diet consists of arthropods, vertebrates, seeds, and fruit. The nest is usually built in a thorny bush; the female incubates the clutch of three to five eggs. This is a common species of jay with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".
Description
Green jays are 25–29 cm (9.8–11.4 in) in length. Weight ranges from 66 to 110 grams (2.3 to 3.9 oz).[2] They have feathers of yellowish-white with blue tips on the top of the head, cheeks and nape, though some taxa have more blue than others. The breast and underparts range from bright yellow in the south to pale green in the north (e.g., Texas). The upper parts are rich green. It has large nasal bristles that form a distinct tuft in some subspecies, but are less developed in others. The color of the iris ranges from dark brownish to bright yellow depending on the subspecies.
Taxonomy
Usually lumped with Inca jay (C. yncas yncas) of South America. Somewhat confusing in classification, the green jay is then used as the species name, even though the inca jay is the nominate subspecies.[3][4] Some authorities split the two species with the Inca jay retaining the binomial C. yncas and the green jay adopting C. luxuosus.[5]
Behavior
Green jays feed on a wide range of insects and other invertebrates and various cereal grains. They take ebony (Ebenopsis spp.) seeds where these occur, and also any oak species' acorns, which they will cache. Meat and human scraps add to the diet when opportunity arises. Green jays have been observed using sticks as tools to extract insects from tree bark.[6]
Breeding
Green jays usually build a nest in a tree or in a thorny bush or thicket, and the female lays three to five eggs. Only the female incubates, but both parents take care of the young.[2]
Voice
As with most of the typical jays, this species has a very extensive voice repertoire. The bird's most common call makes a rassh-rassh-rassh sound, but many other unusual notes also occur. One of the most distinctive calls sounds like an alarm bell.
Distribution and habitat
The green jay group occurs from southern Texas to Honduras. The Inca jay subspecies then have a disjunct home range in the northern Andes in South America.
Status
The green jay is a common species throughout most of its wide range. It is an adaptable species and the population is thought to be increasing as clearing of forests is creating new areas of suitable habitat. No particular threats have been identified, and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".[1]
References
- ^ a b Template:IUCN
- ^ a b "Green jay". All About Birds. Cornell Lab of Ornithology. Retrieved 20 March 2013.
- ^ Ridgely, R.S.; Greenfield, P.J. (2001). The Birds of Ecuador – Field Guide. Cornell University Press. ISBN 0-8014-8721-8.
- ^ Hilty, Steven L. (2003). Birds of Venezuela. Princeton University Press. ISBN 0-7136-6418-5.
- ^ Gill, F.; Donsker, D., eds. (2016). "IOC World Bird List (v 6.1)". doi:10.14344/IOC.ML.6.1.
{{cite web}}: Missing or empty|url=(help) - ^ Gayou, Douglas C. (1982). "General Notes: Tool use by Green Jays" (PDF). Wilson Bulletin. 94 (4): 593–594.
External links
- Green jay stamps from Belize and Venezuela at bird-stamps.org
- BirdLife species factsheet for Cyanocorax yncas
- "Cyanocorax yncas". Avibase.
- "Green jay media". Internet Bird Collection.
- Green jay photo gallery at VIREO (Drexel University)
- Green jay species account at Neotropical Birds (Cornell Lab of Ornithology)
- Interactive range map of Cyanocorax yncas at IUCN Red List maps
- Audio recordings of Green jay on Xeno-canto.
- Cyanocorax yncas in Field Guide: Birds of the World on Flickr
