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We measured variation in coloration from three plumage patches (red face, blue rump, red tail) in an introduced population of rosy\u2010faced lovebirds (<jats:italic>Agapornis roseicollis<\/jats:italic>) in Phoenix, Arizona, USA and examined color differences between the sexes and ages as well as relationships with several indices of quality, including disease presence\/absence (infection with beak and feather disease, <jats:italic>Circovirus parrot<\/jats:italic>, and a polyomavirus, <jats:italic>Gammapolyomavirus avis<\/jats:italic>), nutritional state (e.g., blood glucose and ketone levels), and habitat type from which birds were captured. We found that different plumage colors were linked to different quality indices: (a) adults had redder faces than juveniles, and birds with brighter faces had lower glucose levels and were less likely to have polyomavirus; (b) males had bluer rumps than females; and (c) birds caught farther from the city had redder and darker tail feathers than those caught closer to the urban center. Our findings reveal diverse information underlying variation in the expression of these disparate, ornate feather traits in an introduced parrot species, and suggest that these condition\u2010dependent and\/or sexually dichromatic features may serve important intraspecific signaling roles (i.e., mediating rival competitions or mate choices).<\/jats:p>","DOI":"10.1002\/jez.2867","type":"journal-article","created":{"date-parts":[[2024,9,16]],"date-time":"2024-09-16T10:40:17Z","timestamp":1726483217000},"page":"48-58","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Variation in Plumage Coloration of Rosy\u2010Faced Lovebirds (<i>Agapornis roseicollis<\/i>): Links to Sex, Age, Nutritional Condition, Viral Infection, and Habitat Urbanization"],"prefix":"10.1002","volume":"343","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5196-6620","authenticated-orcid":false,"given":"Kevin 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