Piranga olivacea

Piranga olivacea
Name	Summer tanager
Status	LC
Status system	IUCN3.1
Genus	Piranga
Species	olivacea
Authority	(Gmelin, 1789)

Piranga olivacea is a medium-sized passerine bird of eastern North America known commonly as the summer tanager. It is a migratory species that breeds in temperate forests of the United States and winters in tropical Central and South America. The species has attracted attention from ornithologists, conservationists, and naturalists for its striking plumage and ecological role in insect control.

Taxonomy and etymology

Described by Johann Friedrich Gmelin in 1789, the species was historically placed in the family Cardinalidae after molecular studies revised relationships formerly assigned to Thraupidae. Comparative phylogenetic analyses published in journals associated with institutions such as the Smithsonian Institution and American Museum of Natural History clarified affinities among North American seed-eating passerines. The generic name derives from earlier classical nomenclature used by 18th-century naturalists in correspondence between figures like John James Audubon and European taxonomists; the specific epithet olivacea refers to the olive tones noted by early observers. Major taxonomic treatments in works edited by the American Ornithological Society and summarized in checklists maintained by organizations such as the International Ornithologists' Union standardize the current classification.

Description

Adults exhibit sexual dimorphism: males are predominantly red and were notable subjects in plates by John James Audubon and illustrations used by the Audubon Society, while females and immatures show yellow-olive tones resembling plumage depicted in field guides produced by publishers like Roger Tory Peterson's imprint and National Geographic. The bird's size and proportions are comparable to other members of the genus treated in monographs at institutions such as the Royal Ontario Museum and Field Museum of Natural History. Diagnostic features noted in species accounts from the Cornell Lab of Ornithology include a conical bill, rounded tail, and uniform coloration lacking wing bars, distinguishing it from similar species covered in works by Kenn Kaufman and field keys used in birding surveys by groups like BirdLife International.

Distribution and habitat

Breeding range extends across portions of the eastern United States, with breeding records in states cited in conservation assessments by agencies such as the U.S. Fish and Wildlife Service and avifaunal atlases produced by state natural heritage programs like those of Texas and Georgia. Migration corridors include stopover sites documented along flyways mapped by the Migratory Bird Treaty Act-era monitoring projects coordinated with the National Audubon Society and the North American Bird Conservation Initiative. Wintering grounds reach into Mexico, Central America, and northern South America with records compiled by museums such as the Carnegie Museum of Natural History and research groups associated with Instituto de Investigaciones Tropicales. Preferred habitats during breeding include deciduous and mixed woodlands described in regional guides by entities like the U.S. Forest Service and urban-suburban greenways inventoried by municipal parks departments such as those in Chicago and Atlanta.

Behavior and ecology

Foraging behavior focuses on aerial hawking of hymenopterans and coleopterans as documented in studies published through the Wilson Ornithological Society and field reports from conservation NGOs including The Nature Conservancy. The species has been observed preying on bees and wasps, a behavior noted in natural history notes archived at the American Museum of Natural History and in accounts by prominent ornithologists associated with universities such as Cornell University. Vocalizations and song structure are characterized in sonograms stored in databases managed by the Macaulay Library and referenced in acoustic studies conducted by researchers affiliated with institutions like Harvard University and Yale University. Interactions with sympatric species, such as competitive dynamics with members of Setophaga and Cardinalis, are discussed in community ecology papers appearing in journals tied to societies like the Ecological Society of America.

Breeding and reproduction

Nesting ecology includes cup nests placed in the outer branches of mature trees, with nest descriptions included in breeding bird atlases compiled by organizations such as the Audubon Society and state wildlife agencies like the Pennsylvania Game Commission. Clutch size, incubation periods, and parental care behaviors have been reported in field studies coordinated by university ornithology departments at institutions like University of Michigan and Louisiana State University. Brood parasitism rates and nest predation pressures are evaluated in research funded by conservation foundations such as the National Fish and Wildlife Foundation and are included in management recommendations issued by the U.S. Fish and Wildlife Service.

Conservation status

Assessed as Least Concern by the International Union for Conservation of Nature, the species faces region-specific threats documented in assessments by the North American Bird Conservation Initiative and monitoring programs run by groups like Partners in Flight. Habitat loss from land-use changes cataloged by agencies such as the U.S. Geological Survey and pesticide exposure issues raised by environmental organizations including Environmental Defense Fund are cited in conservation literature. Continued population monitoring through long-term projects like the Breeding Bird Survey and migratory counts coordinated by the Audubon Christmas Bird Count informs adaptive management strategies promoted by conservation coalitions involving the National Wildlife Federation and local land trusts.

Category:Cardinalidae