All (in this database) Birds list (Scientific names): Part U
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- uaireni Phelps & Phelps, 1950 (Lepidocolaptes souleyetii)
- ubonense Deignan, 1947 (Pellorneum ruficeps)
- ucayalae (Chapman, 1928) (Simoxenops)
- ucayalae Chapman, 1929 (Glaucidium brasilianum)
- uchidai Kuroda, 1920 (Dicaeum minullum)
- uchidai Kuroda, 1916 (Pyrrhula nipalensis)
- udzungwensis Dinesen, Hansen, Lehmberg, Svendsen, & Fjeldsa, 1994 (Xenoperdix)
- uelensis Chapin, 1916 (Paludipasser locustella)
- uellensis (Reichenow, 1912) (Treron calvus)
- ufipae (Grant & Mackworth-Praed, 1941) (Bradypterus lopezi)
- ufipae (Moreau, 1942) (Pseudalethe poliocephala)
- ugandae Salvadori, 1906 (Lagonosticta rubricata)
- ugandae Someren, 1921 (Ortygospiza atricollis)
- ugandae Reichenow, 1904 (Passer griseus)
- ugandae (Someren, 1915) (Illadopsis fulvescens)
- ugandae Someren, 1915 (Bleda eximius)
- ugandae (Someren, 1915) (Eurillas gracilis)
- ugandae Neumann, 1908 (Agapornis pullarius)
- ugiensis (Ramsay, 1882) (Monarcha castaneiventris)
- ugiensis Mayr, 1931 (Rhipidura rufifrons)
- ugiensis (Ramsay, 1882) (Zosterops)
- ugogensis Reichenow, 1911 (Uraeginthus bengalus)
- ujhelyii (Madarasz, 1912) (Colaptes punctigula)
- ukamba Lynes, 1930 (Cisticola chiniana)
- ukrainae (Zarudny, 1917) (Emberiza schoeniclus)
- ulietanus(+) (Gmelin, 1788) (Cyanoramphus)
- ultima Mayr, 1949 (Amaurornis moluccana)
- ultima Mayr, 1955 (Coracina remota)
- ultima Mayr & Ripley, 1941 (Lalage maculosa)
- ultima Koelz, 1949 (Carduelis carduelis)
- ultima Bryan, 1917 (Telespiza)
- ultima Bates, 1933 (Cercomela melanura)
- ultima Lawson, 1962 (Batis mixta)
- ultima Griscom, 1935 (Elaenia frantzii)
- ultima Murphy, 1949 (Pterodroma)
- ultimus Bangs & Griscom, 1932 (Xiphorhynchus flavigaster)
- ultimus Diamond, 1969 (Epimachus fastosus)
- ultimus Ripley, 1950 (Phrygilus unicolor)
- ultimus Mayr, 1955 (Zosterops hypoxanthus)
- ultra Ripley, 1948 (Athene brama)
- ultramarina (Bonaparte, 1825) (Aphelocoma)
- ultramarina Lawrence, 1864 (Dacnis cayana)
- ultramarina (Gmelin, 1789) (Vidua chalybeata)
- ultramarina (Kuhl, 1820) (Vini)
- ultramarinus (Bonaparte, 1841) (Cyanistes teneriffae)
- uluensis (Ogilvie-Grant, 1892) (Scleroptila shelleyi)
- uluensis (Neumann, 1900) (Ploceus vitellinus)
- uluguru Neumann, 1914 (Apalis thoracica)
- ulula (Linnaeus, 1758) (Surnia)
- umbelloides (Douglas, 1829) (Bonasa umbellus)
- umbellus (Linnaeus, 1766) (Bonasa)
- umboi Hartert, 1926 (Philemon cockerelli)
- umbra (Richmond, 1903) (Otus)
- umbraticola Grinnell & Swarth, 1926 (Pipilo maculatus)
- umbraticus Wetmore, 1951 (Xenerpestes minlosi)
- umbratilis (Strickland, 1849) (Rhinomyias)
- umbratilis (Swinhoe, 1870) (Otus lettia)
- umbretta (Lichtenstein, 1823) (Sclerurus caudacutus)
- umbretta Gmelin, 1789 (Scopus)
- umbrina Griscom, 1930 (Claravis mondetoura)
- umbrina (Reichenow, 1915) (Colluricincla)
- umbrina (Heuglin, 1863) (Strix woodfordii)
- umbrinodorsalis Reichenow, 1910 (Lagonosticta)
- umbrinus Bangs, 1901 (Buteo jamaicensis)
- umbrinus Todd, 1923 (Arremonops conirostris)
- umbrinus (Ridgway, 1887) (Pheugopedius maculipectus)
- umbrosa Rand, 1941 (Melanocharis longicauda)
- umbrosa Mayr, 1931 (Ptiloprora guisei)
- umbrosa Wells, 1982 (Muscicapa dauurica)
- umbrosa (Kloss, 1921) (Stachyris strialata)
- umbrosus Ridgway, 1893 (Formicarius analis)
- umbrosus (Clancey, 1964) (Crithagra scotops)
- umbrosus Moore, 1934 (Lepidocolaptes leucogaster)
- umbrosus Friedmann, 1944 (Manacus manacus)
- umbrovirens (Ruppell, 1840) (Phylloscopus)
- unalaschcensis (Gmelin, 1789) (Passerella iliaca)
- unappendiculatus Blyth, 1860 (Casuarius)
- unchall (Wagler, 1827) (Macropygia)
- uncinatus (Temminck, 1822) (Chondrohierax)
- uncinatus Sclater & Hartlaub, 1881 (Lanius meridionalis)
- uncirostris (Stolzmann, 1926) (Nystalus chacuru)
- undata (Boddaert, 1783) (Sylvia)
- undatus (Ruppell, 1837) (Lybius)
- undatus (Linnaeus, 1766) (Celeus)
- underwoodi Bangs, 1908 (Trogon aurantiiventris)
- underwoodii (Lesson, 1832) (Ocreatus)
- undosus (Reichenow, 1882) (Calamonastes)
- undulata Dubois, 1839 (Anas)
- undulata (Boddaert, 1783) (Gallinago)
- undulata (Jacquin, 1784) (Chlamydotis)
- undulata (Sparrman, 1787) (Glycifohia)
- undulata (Latham, 1802) (Ninox novaeseelandiae)
- undulatus (Shaw, 1811) (Rhyticeros)
- undulatus Mayr, 1944 (Caprimulgus affinis)
- undulatus Todd, 1925 (Hylexetastes stresemanni)
- undulatus (Gmelin, 1789) (Zebrilus)
- undulatus Hargitt, 1889 (Picumnus exilis)
- undulatus (Shaw, 1805) (Melopsittacus)
- undulatus (Temminck, 1815) (Crypturellus)
- unduligera (Pelzeln, 1868) (Frederickena)
- unduliventer (Ruppell, 1836) (Accipiter tachiro)
- ungavus Riley, 1911 (Lagopus lagopus)
- ungujaensis (Grant & Mackworth-Praed, 1947) (Terpsiphone viridis)
- unibrunnea (Lafresnaye, 1853) (Cinnycerthia unirufa)
- unica (Meyer de Schauensee, 1945) (Dixiphia pipra)
- unicincta Cassin, 1860 (Columba)
- unicincta Hellmayr, 1905 (Diglossa mystacalis)
- unicinctus (Temminck, 1824) (Parabuteo)
- unicolor (Jerdon, 1840) (Aerodramus)
- unicolor (Jardine, 1830) (Apus)
- unicolor Forster, 1844 (Haematopus)
- unicolor Salvin, 1867 (Chamaepetes)
- unicolor (Des Murs, 1845) (Mesitornis)
- unicolor (Du Bus de Gisignies, 1847) (Aphelocoma)
- unicolor (Rothschild & Hartert, 1900) (Corvus)
- unicolor (Hartert, 1904) (Bradypterus caudatus)
- unicolor Salvadori, 1878 (Melanocharis nigra)
- unicolor (Gould, 1843) (Lichenostomus)
- unicolor Blyth, 1843 (Cyornis)
- unicolor (Taczanowski, 1884) (Xenopipo)
- unicolor (Fischer & Reichenow, 1878) (Amblyospiza albifrons)
- unicolor Salvin, 1895 (Scytalopus)
- unicolor (Shelley, 1881) (Lamprotornis)
- unicolor Temminck, 1820 (Sturnus)
- unicolor Hodgson, 1843 (Cholornis)
- unicolor (Menetries, 1835) (Myrmotherula)
- unicolor (Sclater, 1859) (Thamnophilus)
- unicolor Cabanis, 1851 (Haplospiza)
- unicolor (Orbigny& Lafresnaye, 1837) (Phrygilus)
- unicolor Sclater, 1856 (Ramphocelus carbo)
- unicolor Lafresnaye, 1846 (Campylorhynchus turdinus)
- unicolor Sclater, 1857 (Myadestes)
- unicolor Tickell, 1833 (Turdus)
- unicolor (Lear, 1831) (Cyanoramphus)
- unicornis Bond & Meyer de Schauensee, 1939 (Pauxi)
- unicus Mayr, 1931 (Pycnopygius ixoides)
- unicus Olson, 1980 (Microbates cinereiventris)
- unicus Hartert, 1897 (Zosterops palpebrosus)
- uniformis Hellmayr, 1909 (Hylexetastes)
- uniformis (Salvin & Godman, 1884) (Xenopipo)
- uniformis Rothschild, 1931 (Chlamydera lauterbachi)
- uniformis Sclater & Salvin, 1873 (Haplospiza rustica)
- uniformis (Robinson, 1917) (Harpactes oreskios)
- unimoda (Sclater, 1883) (Coracina personata)
- unirufa (Orbigny & Lafresnaye, 1838) (Pseudoseisura)
- unirufa Lafresnaye, 1843 (Synallaxis)
- unirufa Salomonsen, 1937 (Terpsiphone cinnamomea)
- unirufa (Lafresnaye, 1840) (Cinnycerthia)
- unirufus (Cabanis & Heine, 1863) (Centropus)
- unirufus Sclater, 1860 (Lipaugus)
- unitatis (Sclater & Mackworth-Praed, 1918) (Cecropis abyssinica)
- unitti Rea, 1991 (Vireo huttoni)
- unwini Hume, 1871 (Caprimulgus europaeus)
- upembae Verheyen, 1951 (Ptyrticus turdinus)
- upembae (Verheyen, 1953) (Ploceus katangae)
- Upucerthia Geoffroy Saint-Hilaire, 1832 (Furnariidae)
- Upupa Linnaeus, 1758 (Upupidae)
- Upupidae (Bucerotiformes)
- Uraeginthus Cabanis, 1851 (Estrildidae)
- Uragus Keyserling & Blasius, 1840 (Fringillidae)
- uralensis Menzbier, 1887 (Tetrao urogallus)
- uralensis Serebrovski, 1927 (Cinclus cinclus)
- uralensis (Grote, 1927) (Poecile montanus)
- uralensis (Malherbe, 1860) (Dendrocopos leucotos)
- uralensis Pallas, 1771 (Strix)
- uraniae Oustalet, 1881 (Rhipidura rufifrons)
- Uratelornis Rothschild, 1895 (Brachypteraciidae)
- urbanoi (Zimmer & Phelps, 1946) (Cyphorhinus arada)
- urbicum (Linnaeus, 1758) (Delichon)
- Uria Brisson, 1760 (Alcidae)
- urichi (Chapman, 1899) (Phyllomyias)
- urile (Gmelin, 1789) (Phalacrocorax)
- urinator Wetmore, 1945 (Pelecanus occidentalis)
- urinatrix (Gmelin, 1789) (Pelecanoides)
- Urochroa Gould, 1856 (Trochilidae)
- urochrysia (Gould, 1861) (Chalybura)
- Urocissa Cabanis, 1850 (Corvidae)
- Urocolius Bonaparte, 1854 (Coliidae)
- Urocynchramidae Domaniewski, 1918 (Passeriformes)
- Urocynchramus Prjevalsky, 1876 (Urocynchramidae)
- Urodynamis Salvadori, 1880 (Cuculidae)
- urogallus Linnaeus, 1758 (Tetrao)
- Uroglaux Mayr, 1937 (Strigidae)
- Urolais Alexander, 1903 (Cisticolidae)
- Urolestes Cabanis, 1850 (Laniidae)
- Uropelia Bonaparte, 1855 (Columbidae)
- urophasianus (Bonaparte, 1827) (Centrocercus)
- uropigyalis (Orbigny & Lafresnaye, 1837) (Sicalis)
- Uropsalis Miller, 1915 (Caprimulgidae)
- Uropsila Sclater & Salvin, 1873 (Troglodytidae)
- uropygialis Gray, 1866 (Collocalia esculenta)
- uropygialis Stresemann & Paludan, 1932 (Ducula rufigaster)
- uropygialis Gray, 1861 (Ceyx lepidus)
- uropygialis Gould, 1838 (Acanthiza)
- uropygialis Sclater & Salvin, 1871 (Pheucticus aureoventris)
- uropygialis (Fraser, 1843) (Cisticola juncidis)
- uropygialis Berlepsch, 1892 (Coereba flaveola)
- uropygialis (Sclater & Salvin, 1876) (Lipaugus)
- uropygialis Stresemann & Paludan, 1934 (Lonchura castaneothorax)
- uropygialis Sharpe, 1869 (Nigrita fusconotus)
- uropygialis (Sclater, 1862) (Carduelis)
- uropygialis (Lawrence, 1863) (Stelgidopteryx ruficollis)
- uropygialis Lafresnaye, 1843 (Cacicus)
- uropygialis (Gray, 1862) (Pitohui kirhocephalus)
- uropygialis Gould, 1840 (Pardalotus striatus)
- uropygialis (Rand, 1940) (Ptilorrhoa castanonota)
- uropygialis Nelson, 1899 (Pachyramphus major)
- uropygialis (Lawrence, 1869) (Phyllomyias)
- uropygialis Salvadori, 1874 (Zosterops)
- uropygialis (Heuglin, 1862) (Pogoniulus pusillus)
- uropygialis (Baird, 1854) (Melanerpes)
- uropygiatus (Wied-Neuwied, 1831) (Attila spadiceus)
- Urorhipis Heuglin, 1871 (Cisticolidae)
- Urosphena Swinhoe, 1877 (Cettiidae)
- urosticta (Sclater, 1857) (Myrmotherula)
- Urosticte Gould, 1853 (Trochilidae)
- urostictus (Salvadori, 1870) (Pycnonotus)
- Urothraupis Taczanowski & Berlepsch, 1885 (Thraupidae)
- Urotriorchis Sharpe, 1874 (Accipitridae)
- urschi Lavauden, 1929 (Lophotibis cristata)
- ursulae (Alexander, 1903) (Cinnyris)
- urubambae Zimmer, 1939 (Scytalopus)
- urubambae Zimmer, 1932 (Formicivora rufa)
- urubambae Zimmer, 1947 (Hemispingus superciliaris)
- urubambae Zimmer, 1943 (Tangara parzudakii)
- urubambae Zimmer, 1944 (Thraupis episcopus)
- urubambae Zimmer, 1941 (Elaenia albiceps)
- urubambae Zimmer, 1937 (Ochthoeca leucophrys)
- urubambensis (Todd, 1926) (Carduelis magellanica)
- urubambensis (Chapman, 1919) (Asthenes)
- urubitinga (Gmelin, 1788) (Buteogallus)
- uruguaiensis (Hekstra, 1982) (Megascops choliba)
- urumutum (Spix, 1825) (Nothocrax)
- urutani (Phelps & Dickerman, 1980) (Syndactyla roraimae)
- usambara Sclater, 1932 (Hyliota)
- usambarae (Conover, 1928) (Pternistis squamatus)
- usambarae Reichenow, 1917 (Bradypterus lopezi)
- usambarae Macdonald, 1940 (Sheppardia sharpei)
- usambarae (Grote, 1919) (Arizelocichla nigriceps)
- usambaricus Rand, 1957 (Laniarius fuelleborni)
- usambaricus Grote, 1922 (Cinnyris)
- usambiro Neumann, 1908 (Trachyphonus darnaudii)
- usheri Morrison, 1947 (Asthenes huancavelicae)
- ussheri (Sharpe, 1870) (Telacanthura)
- ussheri Reichenow, 1905 (Pholidornis rushiae)
- ussheri (Sharpe, 1882) (Tchagra australis)
- ussheri (Sharpe, 1871) (Muscicapa)
- ussheri (Gould, 1877) (Erythropitta)
- ussheri Sharpe, 1902 (Indicator conirostris)
- ussheri Sharpe, 1871 (Scotopelia)
- ussuriana (Seebohm, 1881) (Urosphena squameiceps)
- ussuriensis Buturlin, 1934 (Tringa totanus)
- ussuriensis (Kohts, 1911) (Lyrurus tetrix)
- ussuriensis (Hartert, 1903) (Carduelis sinica)
- ussuriensis Buturlin, 1915 (Uragus sibiricus)
- ussuriensis Johansen, 1952 (Anthus richardi)
- ussuriensis Poliakov, 1915 (Bubo bubo)
- ussuriensis (Buturlin, 1910) (Otus semitorques)
- usta (Sclater, 1858) (Megascops watsonii)
- usticollis Sundevall, 1850 (Eremomela)
- ustulata Todd, 1927 (Phlegopsis erythroptera)
- ustulatus Salvin & Godman, 1883 (Microcerculus)
- ustulatus (Nuttall, 1840) (Catharus)
- utakwensis (Ogilvie-Grant, 1915) (Lichenostomus subfrenatus)
- uthaii Eames, 2002 (Yuhina gularis)
- utilensis Twomey, 1956 (Buteogallus anthracinus)
- utupuae (Mayr, 1931) (Todiramphus chloris)
- utupuae Mayr, 1932 (Pachycephala vitiensis)
- utupuae Mayr, 1931 (Rhipidura rufifrons)
- uvaeensis (Layard & Layard, 1882) (Eunymphicus)
- uzungwensis (Bangs & Loveridge, 1931) (Pternistis squamatus)
- uzungwensis Jensen & Stuart, 1982 (Phyllastrephus flavostriatus)
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Markku Savela