Cedar waxwing
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| Cedar waxwing | |
|---|---|
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| Name | Cedar waxwing |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Bombycilla |
| Species | cedrorum |
| Authority | (Vieillot, 1816) |
Cedar waxwing is a medium-sized passerine bird in the family Bombycillidae, noted for its sleek plumage, crest, and wax-like red wing tips. It is a highly social, nomadic species that breeds in open woodlands across North America and winters in more southerly regions, feeding largely on fruit and insects. The species is recognized for its role in seed dispersal and its conspicuous presence in human-modified landscapes.
Taxonomy and systematics
Bombycilla cedrorum was described by Louis Jean Pierre Vieillot in 1816 and placed in the genus Bombycilla, which also contains Bohemian waxwing, Japanese waxwing, and Hypocolius-related taxa historically debated among ornithologists. Molecular phylogenetic studies using mitochondrial and nuclear markers have clarified relationships within Bombycillidae and between waxwings and other passerines studied by teams at institutions such as the Smithsonian Institution and the American Museum of Natural History. The species name cedrorum reflects early reports associating the bird with juniper and cedar berries noted by naturalists in the early 19th century. Taxonomic treatments in regional checklists from the American Ornithological Society and the Canadian Wildlife Service maintain B. cedrorum as a distinct species, with no widely accepted subspecies. Historical authors such as John James Audubon and later systematists including Elliott Coues contributed to early descriptions and distributional knowledge.
Description
Adults measure approximately 16–20 cm in length with a 24–27 cm wingspan and weigh 30–40 g, exhibiting pale brown and gray upperparts, a crest, and a black mask bordered with white. Diagnostic field marks include a yellow-tipped tail and the conspicuous red, waxy appendages on the wing secondary feathers; treatment of these features appears in guides from Roger Tory Peterson and the Royal Ontario Museum collections. Plumage molting and seasonal wear have been documented in studies at the Cornell Lab of Ornithology and by observers associated with the American Birding Association. Juveniles show streaked underparts and smaller or absent wax tips; museum specimens in the British Museum and the Field Museum of Natural History illustrate ontogenetic variation.
Distribution and habitat
The breeding range extends across much of Canada, including provinces such as British Columbia, Ontario, and Quebec, and into northern and central United States states like Minnesota, Michigan, and New York. Winter movements reach the southern United States, parts of Mexico, and sporadically Caribbean islands. Habitats used for breeding and foraging include open woodlands, orchard edges, riparian corridors, suburban parks, and hedgerows; these habitat associations are discussed in regional avifauna treatments from the National Audubon Society and conservation assessments by NatureServe. Waxwings are notably associated with fruiting trees such as Juniperus stands, Acer alleys, and ornamental Prunus plants in urban and rural settings.
Behavior and ecology
Cedar waxwings are highly gregarious, forming flocks that can number from a few dozen to several hundred individuals during migration and winter; flock dynamics have been described in field studies published by researchers at the University of Minnesota and the University of British Columbia. Vocalizations are soft, high-pitched calls used for contact and coordination; sonograms and call analyses have been archived at the Macaulay Library. Roosting behavior often involves communal night-time aggregations in dense cover similar to descriptions in natural history accounts by Alexander Wilson. Waxwings participate in mutualistic interactions with fruiting plants, acting as effective long-distance seed dispersers noted in ecological studies associated with the Ecological Society of America.
Breeding and life cycle
Breeding begins in late spring across the northern portions of the range, with nests constructed in horizontal branches of deciduous trees such as Acer and Populus. Clutch size typically ranges from 3–6 eggs; incubation and nestling periods and parental care patterns have been quantified in demographic studies from field stations like the Hubbard Brook Experimental Forest. Pairs may exhibit courtship behaviors including feeding displays and the well-known bill-passing of food items, recorded in behavioral monographs by ornithologists affiliated with Cornell University. Fledging success and annual productivity vary with fruit abundance and weather, factors considered in long-term monitoring programs conducted by agencies like US Fish and Wildlife Service.
Diet and foraging
Diet consists predominantly of small fruits and berries, supplemented by insects during the breeding season; principal food plants include species in genera such as Juniperus, Rubus, Prunus, and Amelanchier. Waxwings are adept at aerial hawking for insects including flies and beetles, behaviors documented in foraging ecology studies from the University of Michigan and reports in the Journal of Field Ornithology. Their role in endozoochorous seed dispersal has implications for plant colonization and succession processes discussed in literature from the Botanical Society of America and the International Association for Plant Taxonomy.
Conservation and threats
The species is currently classified as Least Concern by IUCN criteria, with population assessments compiled by organizations such as the IUCN, BirdLife International, and national agencies. Threats include collisions with windows and vehicles in urbanizing landscapes, exposure to pesticides in agricultural regions, and periodic food shortages during irruptive winters; mitigation measures are promoted by conservation groups including the National Audubon Society and local chapters of the Nature Conservancy. Citizen-science programs such as eBird, the Christmas Bird Count, and the Breeding Bird Survey provide data for monitoring population trends and informing management by state and federal wildlife agencies.
Category:Bombycilla Category:Birds of North America