Catharus
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The genus Catharus is an evolutionary clade of forest-dwelling passerine birds in the family Turdidae (thrushes), commonly known as nightingale-thrushes.[2] The extant species are widely distributed across the Americas and are descended from a common ancestor that lived 4–6 million years ago.[3] Most of the species are shy of humans, seldom leaving the cover of dense forest vegetation, where their activities are hidden from view. Thus, many fundamental aspects of their biology and life histories are poorly known.[4][5][6]
Nightingale-thrushes are small omnivorous songbirds that, like their sister species the wood thrush (Hylocichla mustelina), exhibit a variety of migratory and non-migratory habits.[3][7] Multiple species are long-distance migrants that breed in North America and "winter" in the Neotropics. The breeding range of one migratory species, the gray-cheeked thrush (C. minimus), extends into eastern Siberia. The remainder of the migratory species are restricted to the Americas, notwithstanding occasional vagrant records in Europe[8] and northeast Asia.[9] The non-migratory species are residents of the Neotropical realm.[10][11][12][13][6]
Systematics
Historically, the migratory and residents were placed in two genera: Hylocichla and Catharus, respectively.[14] However, molecular studies indicate that hermit thrush (C. guttatus) is more closely related to three Neotropical species (C. occidentalis, C. gracilirostris, C. frantzii) than to the long-distance migrants which it superficially resembles.[15][7][16][3] This pattern of homoplasy has been interpreted as evidence that seasonal migration had multiple independent origins in the genus (i.e., convergent evolution of phenotypic characters associated with migration),[7] but a 2025 study proposed that it reflects the "budding" of daughter lineages from a long-lived "stem" lineage in evolutionary stasis (which persists today as C. guttatus).[2]
The taxonomy of Catharus dates to the 18th century and has a confusing history resulting from multiple cryptic species, taxonomic composites, misidentified species, and other historical errors.[13][17][18] The name Catharus, authored by Charles Lucien Bonaparte, is derived from the Ancient Greek Script error: No such module "Lang". (Script error: No such module "lang".) meaning "pure" or "clean", and refers to the plumage of the orange-billed nightingale-thrush (C. aurantiirostris).[19]
Species delimitation in Catharus remains an active topic of study and multiple taxonomic splits have been proposed and/or adopted during the last half century, to recognize long-overlooked cryptic species. For example, evidence supporting the split of C. frantzii and C. occidentalis was published in 1969;[13] evidence supporting the split of C. bicknelli and C. minimus was published in 1993;[20] evidence supporting the split of C. dryas and C. maculatus was published in 2017;[12] evidence supporting the split of C. fuscater into seven species was published in 2023, including a newly described species from Panama called Darien Nightingale-thrush (C. arcanus);[21] and Halley (2025) has recently argued that C. mexicanus should be treated as two species.[22] The sister taxa C. ustulatus and C. swainsoni have also been treated at species rank by some authors.[18][23] Even with these various splits, a recent study suggests that species diversity in Catharus may still be underestimated.[2]
The nightingale-thrushes, revered for their beautiful songs, have long been compared to the common nightingale (Luscinia megarhynchos). Theodore Roosevelt once remarked that, "In melody, and above all in that finer, higher melody where the chords vibrate with the touch of eternal sorrow, [L. megarhynchos] cannot rank with such singers as the Wood Thrush and Hermit Thrush. The serene, ethereal beauty of the Hermit's song, rising and falling through the still evening under the archways of hoary mountain forests that have endured from time everlasting".[24] A study published in 2014 presented evidence that hermit thrush songs, like human music, tend to be constructed of frequency ratios that are expressed as simple mathematical ratios and follow the harmonic series.[25]
|
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| Molecular phylogeny of Catharus based on Everson et al. (2019)[26] with updates from Halley et al. (2017) and Halley (2019) |
Species
| Image | Scientific name | Common name | Distribution |
|---|---|---|---|
| File:Catharus dryas 2.jpg | Catharus dryas | Yellow-throated nightingale-thrush | Resident: Middle America. |
| File:Catharus maculatus.jpg | Catharus maculatus | Speckled nightingale-thrush (split from C. dryas) |
Resident: South America. |
| File:Orange-billed Nightingale-Thrush, La Concordia, Mexico (17001712972).jpg | Catharus aurantiirostris | Orange-billed nightingale-thrush | Resident: Mexico to Colombia and Brazil. |
| File:Catharus mexicanus -Costa Rica-8.jpg | Catharus mexicanus | Black-headed nightingale-thrush | Resident: Mexico to Costa Rica. |
| File:Catharus fuscater Santa Elena 1.JPG | Catharus fuscater | Slaty-backed nightingale-thrush | Resident: Costa Rica to Bolivia. |
| File:Catharus ustulatus -North Dakota-8a.jpg | Catharus swainsoni | Swainson's thrush | Migratory: breeds in North America, winters in Central and South America. |
| File:Black-billed Nightingale-thrush.jpg | Catharus gracilirostris | Black-billed nightingale-thrush | Resident: Costa Rica and Panama. |
| File:Hermit thrush (10787).jpg | Catharus guttatus | Hermit thrush | Migratory: breeds and winters in North America. |
| File:Russet Nightingale-thrush.jpg | Catharus occidentalis | Russet nightingale-thrush | Resident: Mexico. |
| File:Catharus frantzii 57202978.jpg | Catharus frantzii | Ruddy-capped nightingale-thrush | Resident: Mexico to Panama. |
| File:Gray-cheeked thrush (71096).jpg | Catharus minimus | Gray-cheeked thrush | Migratory: breeds in North America, winters in South America |
| File:Catharus bicknelli Mount Ellen 3.jpg | Catharus bicknelli | Bicknell's thrush | Migratory: breeds in northeastern North America, winters in Hispaniola |
| File:Veery in CP (43277).jpg | Catharus fuscescens | Veery | Migratory: breeds in North America, winters in South America |
References
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- ^ a b c Page Module:Citation/CS1/styles.css has no content.Halley, Matthew R.; Catanach, Therese A.; Klicka, John; Weckstein, Jason D. (2025-07-17). "Phylogenetic comparative analysis of functional morphology sheds light on the evolution of seasonal migration in nightingale-thrushes (Turdidae: Catharus)". Scientific Reports. 15 (1): 25951. Bibcode:2025NatSR..1525951H. doi:10.1038/s41598-025-11396-x. ISSN 2045-2322. PMC 12271567. PMID 40676108.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Voelker, Gary; Bowie, Rauri C. K.; Klicka, John (2013). "Gene trees, species trees and Earth history combine to shed light on the evolution of migration in a model avian system". Molecular Ecology. 22 (12): 3333–3344. Bibcode:2013MolEc..22.3333V. doi:10.1111/mec.12305. ISSN 1365-294X. PMID 23710782. S2CID 28796611.
- ^ Page Module:Citation/CS1/styles.css has no content.Goetz, James E.; McFarland, Kent P.; Rimmer, Christopher C. (2003). "Multiple Paternity and Multiple Male Feeders in Bicknell's Thrush (Catharus bicknelli)". The Auk. 120 (4): 1044–1053. doi:10.2307/4090275. ISSN 0004-8038. JSTOR 4090275.
- ^ Page Module:Citation/CS1/styles.css has no content.Halley, Matthew R.; Heckscher, Christopher M.; Kalavacharla, Venugopal (2016-06-22). "Multi-Generational Kinship, Multiple Mating, and Flexible Modes of Parental Care in a Breeding Population of the Veery (Catharus fuscescens), a Trans-Hemispheric Migratory Songbird". PLOS ONE. 11 (6) e0157051. Bibcode:2016PLoSO..1157051H. doi:10.1371/journal.pone.0157051. ISSN 1932-6203. PMC 4917174. PMID 27331399.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Greeney, Harold F.; Dyrcz, Andrzej; Mikusek, Romuald; Port, Jeff (2015-06-01). "Cooperative Breeding at a Nest of Slaty-backed Nightingale-Thrushes (Catharus fuscater)". The Wilson Journal of Ornithology. 127 (2): 323–325. doi:10.1676/wils-127-02-323-325.1. ISSN 1559-4491. S2CID 83730135.
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