species
101.
species
102.
species
112.
species
171.
species
198.
species
202.
species
211.
species
214.
species
229.
species
237.
species
241.
species
244.
species
247.
species
255.
species
260.
species
265.
species
281.
species
285.
species
304.
species
316.
species
327.
species
341.
species
342.
species
396.
species
400.
species
403.
species
404.
species
406.
species
422.
species
439.
species
445.
species
459.
species
464.
species
466.
species
472.
species
479.
species
480.
species
513.
species
517.
species
518.
species
519.
species
520.
species
522.
species
526.
species
532.
species
553.
species
573.
species
574.
species
599.
species
601.
species
626.
species
628.
species
647.
species
648.
species
649.
species
668.
species
705.
species
711.
species
727.
species
746.
species
750.
species
755.
species
757.
species
791.
species
795.
species
817.
species
840.
species
842.
species
878.
species
882.
species
897.
species
899.
species
921.
species
941.
species
954.
species
972.
species
979.
species
994.
species
995.
species
1017.
species
1043.
species
1061.
species
1065.
species
1068.
species
1073.
species
1093.
species
1124.
species
1133.
species
1134.
species
1136.
species
1137.
species
1138.
species
1149.
species
1150.
species
1152.
species
1157.
species
1195.
species
1213.
species
1214.
species
1216.
species
1217.
species
1219.
species
1222.
species
1235.
species
1240.
species
1241.
species
1250.
species
1272.
species
1278.
species
1279.
species
1280.
species
1282.
species
1284.
species
1296.
species
1299.
species
1306.
species
1312.
species
1327.
species
1330.
species
1333.
species
1339.
species
1340.
species
1344.
species
1352.
species
1363.
species
1391.
species
1403.
species
1416.
species
1425.
species
1426.
species
1427.
species
1434.
species
1436.
species
1438.
species
1441.
species
1448.
species
1450.
species
1453.
species
1456.
species
1458.
species
1463.
species
1488.
species
1492.
species
1493.
species
1501.
species
1502.
species
1506.
species
1509.
species
1510.
species
1516.
species
1519.
species
1532.
species
1540.
species
1545.
species
1546.
species
1548.
species
1557.
species
1559.
species
1560.
species
1574.
species
1575.
species
1576.
species
1580.
species
1581.
species
1591.
species
1595.
species
1597.
species
1598.
species
1602.
species
1604.
species
1609.
species
1611.
species
1619.
species
1621.
species
1626.
species
1628.
species
1629.
species
1630.
species
1631.
species
1632.
species
1633.
species
1647.
species
1649.
species
1655.
species
1664.
species
1665.
species
1667.
species
1668.
species
1670.
species
1671.
species
1672.
species
1673.
species
1674.
species
1675.
species
1676.
species
1677.
species
1678.
species
1680.
species
1681.
species
1684.
species
1686.
species
1690.
species
1691.
species
1692.
species
1695.
species
1697.
species
1698.
species
1699.
species
1701.
species
1702.
species
1708.
species
1713.
species
1715.
species
1716.
species
1718.
species
1719.
species
1720.
species
1721.
species
1722.
species
1725.
species
1727.
species
1728.
species
1729.
species
1730.
species
1731.
species
1734.
species
1736.
species
1739.
species
1740.
species
1742.
species
1743.
species
1745.
species
1746.
species
1748.
species
1750.
species
1751.
species
1752.
species
1753.
species
1754.
species
1760.
species
1761.
species
1762.
species
1764.
species
1765.
species
1767.
species
1768.
species
1769.
species
1770.
species
1773.
species
1775.
species
1778.
species
1779.
species
1783.
species
1784.
species
1785.
species
1786.
species
1787.
species
1788.
species
1790.
species
1793.
species
1796.
species
1799.
species
1801.
species
1802.
species
1804.
species
1805.
species
1807.
species
1808.
species
1809.
species
1810.
species
1811.
species
1812.
species
1813.
species
1814.
species
1815.
species
1816.
species
1817.
species
1819.
species
1820.
species
1821.
species
1822.
species
1823.
species
1824.
species
1826.
species
1827.
species
1828.
species
1830.
species
1831.
species
1832.
species
1833.
species
1834.
species
1835.
species
1836.
species
1837.
species
1838.
species
1843.
species
1844.
species
1845.
species
1846.
species
1847.
species
1848.
species
1849.
species
1850.
species
1851.
species
1852.
species
1853.
species
1854.
species
1855.
species
1856.
species
1857.
species
1858.
species
1859.
species
1860.
species
1861.
species
1862.
species
1863.
species
1864.
species
1865.
species
1866.
species
1867.
species
1868.
species
1869.
species
1870.
species
1871.
species
1872.
species
1873.
species
1874.
species
1875.
species
1876.
species
1878.
species
1879.
species
1880.
species
1881.
species
1882.
species
1883.
species
1884.
species
1885.
species
1887.
species
1888.
species
1889.
species
1890.
species
1891.
species
1892.
species
1893.
species
1894.
species
1895.
species
1896.
species
1897.
species
1898.
species
1899.
species
1900.
species
1901.
species
1902.
species
1903.
species
1904.
species
1905.
species
1906.
species
1907.
species
1908.
species
1909.
species
1910.
species
1911.
species
1912.
species
1913.
species
1914.
species
1915.
species
1916.
species
1917.
species
1918.
species
1920.
species
1921.
species
1922.
species
1923.
species
1924.
species
1925.
species
1926.
species
1928.
species
1929.
species
1930.
species
1931.
species
1932.
species
1933.
species
1934.
species
1935.
species
1936.
species
1937.
species
1938.
species
1939.
species
1940.
species
1941.
species
1942.
species
1943.
species
1944.
species
1945.
species
1946.
species
1947.
species
1948.
species
1949.
species
1950.
species
1951.
species
1952.
species
1953.
species
1954.
species
1955.
species
1956.
species
1957.
species
1958.
species
1959.
species
1960.
species
1961.
species
1962.
species
1963.
species
1964.
species
1965.
species
1966.
species
1967.
species
1968.
species
1969.
species
1970.
species
1971.
species
1972.
species
1973.
species
1974.
species
1975.
species
1976.
species
1977.
species
1978.
species
1979.
species
1980.
species
1982.
species
1983.
species
1984.
species
1985.
species
1986.
species
1987.
species
1988.
species
1989.
species
1990.
species
1991.
species
1992.
species
1993.
species
1994.
species
1995.
species
1996.
species
1997.
species
1998.
species
1999.
species
2000.
species
2001.
species
2002.
species
2003.
species
2004.
species
2005.
species
2006.
species
2007.
species
2008.
species
2009.
species
2010.
species
2011.
species
2012.
species
2013.
species
2014.
species
2015.
species
2016.
species
2017.
species
2018.
species
2019.
species
2020.
species
2021.
species
2022.
species
2023.
species
2024.
species
2025.
species
2026.
species
2027.
species
2028.
species
2029.
species
2030.
species
2031.
species
2032.
species
2034.
species
2035.
species
2037.
species
2038.
species
2039.
species
2040.
species
2041.
species
2042.
species
2044.
species
2045.
species
2047.
species
2048.
species
2049.
species
2050.
species
2051.
species
2052.
species
2053.
species
2054.
species
2055.
species
2056.
species
2057.
species
2058.
species
2059.
species
2060.
species
2061.
species
2062.
species
2063.
species
2064.
species
2065.
species
2066.
species
2067.
species
2068.
species
2070.
species
2071.
species
2072.
species
2073.
species
2074.
species
2075.
species
2076.
species
2077.
species
2078.
species
2079.
species
2081.
species
2082.
species
2083.
species
2084.
species
2085.
species
2086.
species
2087.
species
2088.
species
2089.
species
2090.
species
2091.
species
2092.
species
2093.
species
2094.
species
2095.
species
2096.
species
2097.
species
2098.
species
2099.
species
2100.
species
2101.
species
2102.
species
2103.
species
2104.
species
2105.
species
2106.
species
2107.
species
2108.
species
2109.
species
2129.
species
2134.
species
2135.
species
2136.
species
2137.
species
2138.
species
2139.
species
2140.
species
2141.
Puntarenas Screech-Owl (undescribed form)
Tufted x Black-crested Titmouse (hybrid)
Western x Glaucous-winged Gull (hybrid)
Mallard x Mottled Duck (hybrid)
Muscovy Duck x Mallard (hybrid)
Mallard x Northern Pintail (hybrid)
Herring x Glaucous-winged Gull (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Mallard x Mexican Duck (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Black x Eastern Phoebe (hybrid)
Brewster's Warbler (hybrid)
Townsend's x Hermit Warbler (hybrid)
Mallard x American Black Duck (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Mourning Warbler x Common Yellowthroat (hybrid)
Graylag x Canada Goose (hybrid)
Bullock's x Baltimore Oriole (hybrid)
Nuttall's x Ladder-backed Woodpecker (hybrid)
Carolina x Black-capped Chickadee (hybrid)
Eurasian x American Wigeon (hybrid)
Lawrence's Warbler (hybrid)
Glossy x White-faced Ibis (hybrid)
Snow x Ross's Goose (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
Tufted Duck x scaup sp. (hybrid)
Western x Clark's Grebe (hybrid)
American x Black Oystercatcher (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Spotted x Eastern Towhee (hybrid)
Black-capped x Mountain Chickadee (hybrid)
Lazuli x Indigo Bunting (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Anna's x Costa's Hummingbird (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Little Blue Heron x Snowy Egret (hybrid)
MacGillivray's x Mourning Warbler (hybrid)
Spotted x Collared Towhee (hybrid)
Common Black x Red-shouldered Hawk (hybrid)
Swan Goose x Canada Goose (hybrid)
Red-crowned x Hoffmann's Woodpecker (hybrid)
Snowy x Little Egret (hybrid)
Altamira x Audubon's Oriole (hybrid)
Rufous x Allen's Hummingbird (hybrid)
House x Eurasian Tree Sparrow (hybrid)
Herring x Great Black-backed Gull (hybrid)
Redhead x Ring-necked Duck (hybrid)
American Wigeon x Mallard (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Red-crowned x Lilac-crowned Parrot (hybrid)
Red-shouldered x Red-tailed Hawk (hybrid)
Gadwall x Mallard (hybrid)
Greater x Lesser Prairie-Chicken (hybrid)
Downy x Nuttall's Woodpecker (hybrid)
Snow x Canada Goose (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Anna's Hummingbird x Selasphorus sp. (hybrid)
Northern x Tropical Parula (hybrid)
Rose-breasted x Black-headed Grosbeak (hybrid)
White x Scarlet Ibis (hybrid)
Canyon x Spotted Towhee (hybrid)
Sharp-tailed Grouse x Greater Prairie-Chicken (hybrid)
Canvasback x Redhead (hybrid)
White-crowned x Golden-crowned Sparrow (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
White-collared x Golden-collared Manakin (hybrid)
White-crowned x White-throated Sparrow (hybrid)
Northern Pintail x Green-winged Teal (hybrid)
California x Gambel's Quail (hybrid)
Downy x Hairy Woodpecker (hybrid)
Mexican x Mottled Duck (hybrid)
Snow Goose x Brant (hybrid)
Glaucous x Glaucous-winged Gull (hybrid)
Mute x Trumpeter Swan (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Wood Duck x Mallard (hybrid)
Northern Cardinal x Pyrrhuloxia (hybrid)
Kelp x Herring Gull (hybrid)
Golden-fronted x Red-bellied Woodpecker (hybrid)
Northern Shoveler x Gadwall (hybrid)
Common x Barrow's Goldeneye (hybrid)
Anna's x Rufous Hummingbird (hybrid)
Black-throated x White-throated Magpie-Jay (hybrid)
Scaled x Gambel's Quail (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Oriental Turtle-Dove x Eurasian Collared-Dove (hybrid)
Western Kingbird x Scissor-tailed Flycatcher (hybrid)
Herring x Glaucous Gull (hybrid)
Common Goldeneye x Hooded Merganser (hybrid)
Northern Shoveler x Mallard (hybrid)
Scarlet x Western Tanager (hybrid)
American Wigeon x Green-winged Teal (hybrid)
Bufflehead x Common Goldeneye (hybrid)
Bufflehead x goldeneye sp. (hybrid)
Tufted Duck x Greater Scaup (hybrid)
Snow/Ross's x Cackling/Canada Goose (hybrid)
Mallard x Mexican/Mottled Duck (hybrid)
Great Green x Scarlet Macaw (hybrid)
Snow x Cackling Goose (hybrid)
Snow x Greater White-fronted Goose (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Redhead x Lesser Scaup (hybrid)
Cooper's Hawk x American Goshawk (hybrid)
Herring x California Gull (hybrid)
Dunlin x White-rumped Sandpiper (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Canyon x Abert's Towhee (hybrid)
Gadwall x Northern Pintail (hybrid)
Tricolored Heron x Snowy Egret (hybrid)
Ross's x Cackling Goose (hybrid)
American Wigeon x Northern Pintail (hybrid)
Yellow-headed x Oriente Warbler (hybrid)
Black-bellied x Fulvous Whistling-Duck (hybrid)
Western x Flame-colored Tanager (hybrid)
House x Purple Finch (hybrid)
Laughing x Ring-billed Gull (hybrid)
Yellow-bellied/Red-naped x Red-breasted Sapsucker (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
Downy x Ladder-backed Woodpecker (hybrid)
Tufted Duck x Lesser Scaup (hybrid)
Anna's x Broad-billed Hummingbird (hybrid)
Cinnamon x Green-winged Teal (hybrid)
Black-throated Gray x Townsend's Warbler (hybrid)
Great Black-backed x Glaucous Gull (hybrid)
Magnolia x Yellow-rumped Warbler (hybrid)
Red-tailed x Ferruginous Hawk (hybrid)
Red-tailed x Rough-legged Hawk (hybrid)
Redhead x scaup sp. (hybrid)
Ross's x Canada Goose (hybrid)
Canvasback x Ring-necked Duck (hybrid)
Striated x Green Heron (hybrid)
Hooded x Common Merganser (hybrid)
Western x Eastern Kingbird (hybrid)
Eurasian x African Collared-Dove (hybrid)
Barnacle x Canada Goose (hybrid)
Barnacle x Cackling Goose (hybrid)
Yellow-rumped x Townsend's Warbler (hybrid)
Greater White-fronted x Cackling/Canada Goose (hybrid)
Mallard x Green-winged Teal (hybrid)
Red-whiskered x Red-vented Bulbul (hybrid)
goldeneye sp. x Hooded Merganser (hybrid)
Black-headed x Ring-billed Gull (hybrid)
Fischer's x Yellow-collared Lovebird (hybrid)
Gray-crowned x Black Rosy-Finch (hybrid)
Gadwall x American Wigeon (hybrid)
Great Blue x Cocoi Heron (hybrid)
Mountain x Mexican Chickadee (hybrid)
Golden-crowned x White-throated Sparrow (hybrid)
Bufflehead x Hooded Merganser (hybrid)
Steller's x Blue Jay (hybrid)
Northern x Gilded Flicker (hybrid)
Eurasian Collared-Dove x Mourning Dove (hybrid)
Double-crested x Neotropic Cormorant (hybrid)
Cinnamon x Rufous-tailed Hummingbird (hybrid)
Summer x Western Tanager (hybrid)
Anna's x Allen's Hummingbird (hybrid)
Tropical x Northern Mockingbird (hybrid)
Mallard x Pacific Black Duck (hybrid)
Northern Parula x Yellow-throated Warbler (hybrid)
Song x Swamp Sparrow (hybrid)
Yellow-rumped x Hermit Warbler (hybrid)
Steller's Jay x California Scrub-Jay (hybrid)
Tropical Kingbird x Fork-tailed Flycatcher (hybrid)
Herring x Slaty-backed Gull (hybrid)
Ruby-throated x Black-chinned Hummingbird (hybrid)
Northern x Wattled Jacana (hybrid)
Broad-billed x Violet-crowned Hummingbird (hybrid)
American Redstart x Magnolia Warbler (hybrid)
Barn x Cliff Swallow (hybrid)
Glaucous-winged x Slaty-backed Gull (hybrid)
Anna's x Calliope Hummingbird (hybrid)
Lucifer x Black-chinned Hummingbird (hybrid)
Black-chinned x Broad-tailed Hummingbird (hybrid)
Black-chinned x Anna's Hummingbird (hybrid)
Bahama x Northern Mockingbird (hybrid)
Calliope x Rufous Hummingbird (hybrid)
Sandwich x Elegant Tern (hybrid)
Black-chinned x Calliope Hummingbird (hybrid)
Yellow-bellied x Red-breasted Sapsucker (hybrid)
Barn x Cave Swallow (hybrid)
Eastern x Mountain Bluebird (hybrid)
Black-chinned x Broad-billed Hummingbird (hybrid)
Great Egret x Great Blue Heron (hybrid)
Colima x Virginia's Warbler (hybrid)
Common x Arctic Tern (hybrid)
Red-crowned x Red-lored Parrot (hybrid)
Thick-billed x Common Murre (hybrid)
Common x Roseate Tern (hybrid)
Northern Parula x Black-throated Gray Warbler (hybrid)
Western x Chihuahuan Meadowlark (hybrid)
Bay-breasted x Blackpoll Warbler (hybrid)
King x Clapper Rail (hybrid)
Nelson's x Saltmarsh Sparrow (hybrid)
Pine Siskin x American Goldfinch (hybrid)
Spotted x Barred Owl (hybrid)
Chipping x Clay-colored Sparrow (hybrid)
Ruddy Turnstone x White-rumped Sandpiper (hybrid)
Bay-breasted x Blackburnian Warbler (hybrid)
Greater Sage-Grouse x Sharp-tailed Grouse (hybrid)
Black-necked Stilt x American Avocet (hybrid)
Yellow-rumped x Grace's Warbler (hybrid)
White-crowned x Harris's Sparrow (hybrid)
Black-capped x White-eyed Vireo (hybrid)
King x Common Eider (hybrid)
Cape May x Magnolia Warbler (hybrid)
Black-throated Gray x Hermit Warbler (hybrid)
Steller's Jay x Woodhouse's Scrub-Jay (hybrid)
MacGillivray's Warbler x Common Yellowthroat (hybrid)
Ladder-backed x Hairy Woodpecker (hybrid)
Surf x White-winged Scoter (hybrid)
Red-billed x Black-billed Streamertail (hybrid)
Flame-rumped x Scarlet-rumped Tanager (hybrid)
Barrow's Goldeneye x Hooded Merganser (hybrid)
Trumpeter x Tundra Swan (hybrid)
Common x Great-tailed Grackle (hybrid)
Blue-and-yellow x Scarlet Macaw (hybrid)
Mute x Whooper Swan (hybrid)
Trumpeter x Whooper Swan (hybrid)
Dark-eyed Junco x White-crowned Sparrow (hybrid)
Western x Mountain Bluebird (hybrid)
Boat-tailed x Great-tailed Grackle (hybrid)
Mallard x Ring-necked Duck (hybrid)
Tropical x Gray Kingbird (hybrid)
Hairy x White-headed Woodpecker (hybrid)
Black-chinned x Costa's Hummingbird (hybrid)
Couch's Kingbird x Scissor-tailed Flycatcher (hybrid)
Golden x Lady Amherst's Pheasant (hybrid)
Yellow-throated x Blue-headed Vireo (hybrid)
Graylag x Swan Goose (hybrid)
Brown x Blue-footed Booby (hybrid)
Yellow-breasted Chat x new world oriole sp. (hybrid)
Tennessee x Nashville Warbler (hybrid)
Buff-breasted x White-rumped Sandpiper (hybrid)
Dark-eyed x Yellow-eyed Junco (hybrid)
Lucifer x Costa's Hummingbird (hybrid)
Blue-winged Teal x American Wigeon (hybrid)
Cerulean Warbler x Northern Parula (hybrid)
Varied x Painted Bunting (hybrid)
Lapland Longspur x Snow Bunting (hybrid)
California x Crissal Thrasher (hybrid)
Grasshopper x Savannah Sparrow (hybrid)
Ross's x Greater White-fronted Goose (hybrid)
Purple-throated x White-throated Mountain-gem (hybrid)
Tricolored x Chestnut Munia (hybrid)
Little Blue x Tricolored Heron (hybrid)
Curve-billed x Long-billed Thrasher (hybrid)
Gadwall x Green-winged Teal (hybrid)
Redhead x Greater Scaup (hybrid)
Indigo x Painted Bunting (hybrid)
Mountain x Chestnut-backed Chickadee (hybrid)
Northern Shoveler x American Wigeon (hybrid)
Sandhill x Common Crane (hybrid)
Rivoli's x Berylline Hummingbird (hybrid)
Common Gallinule x American Coot (hybrid)
Scarlet-rumped x Crimson-backed Tanager (hybrid)
Ruddy x Common Shelduck (hybrid)
Clay-colored x Field Sparrow (hybrid)
Kentucky Warbler x Common Yellowthroat (hybrid)
Green-tailed x Spotted Towhee (hybrid)
Northern Bobwhite x California Quail (hybrid)
Glaucous x Slaty-backed Gull (hybrid)
American Redstart x Northern Parula (hybrid)
Western x Eastern Meadowlark (hybrid)
Yellow-crowned x Black-crowned Night Heron (hybrid)
Yellow x Prairie Warbler (hybrid)
Black-chinned x Rufous Hummingbird (hybrid)
Song x Lincoln's Sparrow (hybrid)
Laysan x Black-footed Albatross (hybrid)
Black x Say's Phoebe (hybrid)
Mallard x Eastern Spot-billed Duck (hybrid)
Canvasback x scaup sp. (hybrid)
Eurasian Wigeon x Northern Pintail (hybrid)
Blue-and-yellow x Red-and-green Macaw (hybrid)
Yellow-rumped x Black-throated Green Warbler (hybrid)
Emperor x Greater White-fronted Goose (hybrid)
Red-shouldered x Broad-winged Hawk (hybrid)
Yellow x Black-throated Blue Warbler (hybrid)
Chipping x Field Sparrow (hybrid)
American Redstart x Yellow Warbler (hybrid)
Palm x Yellow-rumped Warbler (hybrid)
Costa's x Broad-billed Hummingbird (hybrid)
Western x Eastern Wood-Pewee (hybrid)
Crimson x Eastern Rosella (hybrid)
House x Fish Crow (hybrid)
Rufous x Broad-tailed Hummingbird (hybrid)
Scarlet Tanager x Rose-breasted Grosbeak (hybrid)
Summer x Scarlet Tanager (hybrid)
Magnolia x Palm Warbler (hybrid)
Emperor x Cackling Goose (hybrid)
Ring-necked x Green Pheasant (hybrid)
Lesser x American Goldfinch (hybrid)
Cape May x Yellow-rumped Warbler (hybrid)
Bullock's x Black-backed Oriole (hybrid)
Wood Duck x Hooded Merganser (hybrid)
Chestnut-sided x Black-throated Blue Warbler (hybrid)
Hoffmann's x Golden-fronted Woodpecker (hybrid)
American Wigeon x American Black Duck (hybrid)
Ring-necked x Tufted Duck (hybrid)
Northern Bobwhite x Scaled Quail (hybrid)
Spectacled x King Eider (hybrid)
Snow x McKay's Bunting (hybrid)
Cliff x Cave Swallow (hybrid)
Yellow-rumped x Yellow-throated Warbler (hybrid)
Western x Eastern Screech-Owl (hybrid)
Common x Hoary Redpoll (hybrid)
Hooded x Yellow Warbler (hybrid)
Yellow-rumped x Black-throated Gray Warbler (hybrid)
Peregrine x Prairie Falcon (hybrid)
Mallard x Redhead (hybrid)
Painted x Slate-throated Redstart (hybrid)
Calliope x Broad-tailed Hummingbird (hybrid)
Warbling x Red-eyed Vireo (hybrid)
White-winged x Yellow-chevroned Parakeet (hybrid)
Black-bellied x West Indian Whistling-Duck (hybrid)
Black-necked x Black-winged Stilt (hybrid)
Couch's x Western Kingbird (hybrid)
Sandhill x Whooping Crane (hybrid)
Orange-crowned x Nashville Warbler (hybrid)
Clay-colored x Brewer's Sparrow (hybrid)
Ruby-throated x Broad-tailed Hummingbird (hybrid)
Blue-winged x Prairie Warbler (hybrid)
Magnolia x Chestnut-sided Warbler (hybrid)
Black-crowned x Gray-crowned Palm-Tanager (hybrid)
Brant x Cackling Goose (hybrid)
Nashville x Magnolia Warbler (hybrid)
Magnolia x Black-throated Blue Warbler (hybrid)
Common Yellowthroat x Rufous-capped Warbler (hybrid)
Dusky x Sharp-tailed Grouse (hybrid)
Red Crossbill x Pine Siskin (hybrid)
Great Knot x Surfbird (hybrid)
Violet-green x Northern Rough-winged Swallow (hybrid)
Lucifer x Anna's Hummingbird (hybrid)
Tree x Violet-green Swallow (hybrid)
Violet-green x Cliff Swallow (hybrid)
Rivoli's x White-eared Hummingbird (hybrid)
Philadelphia x Red-eyed Vireo (hybrid)
Veery x Bicknell's Thrush (hybrid)
White-rumped x Pectoral Sandpiper (hybrid)
Grace's x Black-throated Gray Warbler (hybrid)
Common Yellowthroat x Yellow Warbler (hybrid)
Gray-crowned x Common Yellowthroat (hybrid)
Brewer's Blackbird x Great-tailed Grackle (hybrid)
Hepatic x Flame-colored Tanager (hybrid)
Swainson's x Rough-legged Hawk (hybrid)
Herring x Iceland Gull (hybrid)
Black-tailed x Black-capped Gnatcatcher (hybrid)
Mountain x Boreal Chickadee (hybrid)
Tree x Barn Swallow (hybrid)
Wood x Mandarin Duck (hybrid)
Nuttall's x Hairy Woodpecker (hybrid)
Curlew x Pectoral Sandpiper (hybrid)
new world warbler sp.
Lesser/Greater Yellowlegs
Western/Semipalmated Sandpiper
new world oriole sp.
Great/Double-crested Cormorant
Alder/Willow Flycatcher (Traill's Flycatcher)
shorebird sp.
Yellow-billed/Black-billed Cuckoo
Double-crested/Neotropic Cormorant
Mallard/American Black Duck
woodpecker sp.
Philadelphia/Warbling Vireo
Sharp-shinned/Cooper's Hawk
Domestic goose sp. (Domestic type)
Mallard/Mottled Duck
Accipiter sp.
Golden-winged/Blue-winged Warbler
Rufous/Allen's Hummingbird
Short-billed/Long-billed Dowitcher
new world vulture sp.
Surf/Black Scoter
Ruby-throated/Black-chinned Hummingbird
Black-throated Gray/Townsend's Warbler
Carolina/Black-capped Chickadee
Blue-winged/Cinnamon Teal
Western/Glaucous-winged Gull
Tree/Violet-green Swallow
Common/Red-breasted Merganser
Western/Eastern Meadowlark
Hammond's/Dusky Flycatcher
large shorebird sp.
Louisiana/Northern Waterthrush
Downy/Ladder-backed Woodpecker
Philadelphia/Red-eyed Vireo
Red-shouldered/Broad-winged Hawk
Western/Eastern Wood-Pewee
Mallard/Mexican Duck
phalarope sp.
Acanthis/Spinus sp.
Cassin's/Western Kingbird
Townsend's/Hermit Warbler
Parasitic/Pomarine Jaeger
Bronzed/Brown-headed Cowbird
Red-winged/Tricolored Blackbird
gull/tern sp.
Red-naped/Red-breasted Sapsucker
Herring/Glaucous-winged Gull
Western/Chihuahuan Meadowlark
Common/Barrow's Goldeneye
Tufted/Black-crested Titmouse
Bullock's/Baltimore Oriole
Northern Cardinal/Pyrrhuloxia
Ruby-crowned/Golden-crowned Kinglet
Curve-billed/Bendire's Thrasher
House/Purple Finch
Tropical/Couch's Kingbird
House/Eurasian Tree Sparrow
Black-bellied Plover/golden-plover sp.
Passerina sp.
Nuttall's/Ladder-backed Woodpecker
American/Pacific Golden-Plover (Lesser Golden-Plover)
Yellow-crowned/Black-crowned Night Heron
Rose-breasted/Black-headed Grosbeak
Anna's/Costa's Hummingbird
yellow-bellied kingbird sp.
Spotted/Eastern Towhee (Rufous-sided Towhee)
Bay-breasted/Blackpoll Warbler
pewee sp. (Contopus sp.)
Scolopacidae sp.
Yellow-bellied/Red-naped Sapsucker
Cooper's Hawk/American Goshawk
California/Woodhouse's Scrub-Jay
screech-owl sp.
Black-legged/Red-legged Kittiwake
Gray-cheeked/Bicknell's Thrush
Golden-fronted/Red-bellied Woodpecker
Boat-tailed/Great-tailed Grackle
Thick-billed/Common Murre
Blue-capped/Lesson's Motmot
Loggerhead/Northern Shrike
California/Gambel's Quail
Spizella sp./American Tree Sparrow
Eurasian/African Collared-Dove
small plover sp.
Red-crowned/Lilac-crowned Parrot
Black-capped/Mountain Chickadee
Buff-bellied/Rufous-tailed Hummingbird
Tyrannus sp.
Green/Pacific Parakeet
tanager sp. (Piranga sp.)
merganser sp.
Smooth-billed/Groove-billed Ani
oropendola sp.
new world trogon sp.
Setophaga sp.
Sooty/Short-tailed Shearwater
Eastern/Chihuahuan Meadowlark
nightjar sp.
Chipping Sparrow/Worm-eating Warbler
Herring/Lesser Black-backed Gull
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
moorhen/coot/gallinule sp.
sparrow/warbler sp. (trilling song)
Mitred/Red-masked Parakeet
Selasphorus sp.
Northern/Tropical Parula
Charadrius sp.
MacGillivray's/Mourning Warbler
solitary vireo sp.
shearwater sp.
American Three-toed/Black-backed Woodpecker
Patagioenas sp.
Long-eared/Short-eared Owl
White-winged/Yellow-chevroned Parakeet
Tropical/Northern Mockingbird
Russet-naped/Gray-cowled Wood-Rail
longspur sp.
Mexican/Mottled Duck
Varied Thrush/American Robin
Procellaria sp.
Gray/Gray-lined Hawk
Black-billed/Yellow-billed Parrot
Orchard/Hooded Oriole
elaenia sp. (genus Elaenia)
Western/Eastern Cattle Egret
large parakeet sp. (former Aratinga sp.)
cuckoo sp. (Cuculidae sp.)
Northern/Southern Rough-winged Swallow
storm-petrel sp. (white-rumped)
Red-billed/Black-billed Streamertail
Broad-billed/Narrow-billed Tody
Purple-throated/White-throated Mountain-gem
white-eye sp.
Long-tailed/Parasitic Jaeger
Tachycineta sp.
Oak/Juniper Titmouse (Plain Titmouse)
Pterodroma sp.
Black-throated Gray/Hermit Warbler
Cassin's/Blue-headed Vireo
Thalasseus sp.
golden-plover sp.
new world martin sp. (Progne sp.)
White-crowned/White-throated Sparrow
Common Ringed/Semipalmated Plover
Streaked/Sulphur-bellied Flycatcher
Bullock's/Black-backed Oriole
Greater/Lesser Prairie-Chicken
vireo sp. (Red-eyed Vireo complex)
procellariid sp.
Dark-eyed Junco/Pine Warbler
Brown/Long-billed Thrasher
Hudsonian/Marbled Godwit
towhee sp.
Scaly-breasted/Pearly-eyed Thrasher
Russet/Ruddy-capped Nightingale-Thrush
Leach's/Townsend's/Ainley's Storm-Petrel
Sagebrush/Bell's Sparrow (Sage Sparrow)
Gull-billed/Australian Tern
Hepatic/Summer Tanager
American/Black Oystercatcher
foliage-gleaner sp.
Dark-eyed/Yellow-eyed Junco
black-and-white shearwater sp.
tropical pewee sp.
Ash-throated/Nutting's Flycatcher
Botteri's/Cassin's Sparrow
White-winged/Stejneger's Scoter
Common/Yellow-billed Loon
Podiceps sp.
Long-billed/Plain-capped Starthroat
Streptopelia sp.
Long-billed/Long-tailed Hermit
Red/Cassia Crossbill
Antrostomus sp.
Yellow-casqued/Black-casqued Hornbill
Passer sp.
Olive/Green-backed Sparrow
Striated/Green Heron
Yellow-footed/Western Gull
jaeger/skua sp.
eclectus sp.
Scripps's/Guadalupe/Craveri's Murrelet
Eastern/Mexican Whip-poor-will
Red-whiskered/Red-vented Bulbul
King/Common Eider
myna/starling sp.
Pheucticus sp.
Black/Markham's Storm-Petrel
storm-petrel sp. (dark-rumped)
Pacific/Winter Wren
Violet-crowned/Green-fronted Hummingbird
Rusty-margined/Social Flycatcher
Lesser/Greater Roadrunner
Mississippi/Plumbeous Kite
Keel-billed/Broad-billed Motmot
Leach's/Townsend's Storm-Petrel (dark-rumped)
American Black/Mottled Duck
Grasshopper/Baird's Sparrow
albatross sp.
Shiny/Bronzed Cowbird
Hoffmann's/Golden-fronted Woodpecker
Ridgway's/Mangrove/Clapper Rail
Garganey/Green-winged Teal
wood-wren sp.
Middle American/South American Leaftosser
Eurasian Moorhen/Common Gallinule
Tricolored/Chestnut Munia
small tanager sp. (former Tangara sp.)
Morelet's/Cinnamon-rumped Seedeater
leaftosser sp.
Domestic lovebird sp. (Domestic type)
Scripps's/Guadalupe Murrelet (Xantus's Murrelet)
Scripps's/Craveri's Murrelet
Black-throated/White-throated Magpie-Jay
Broad-billed/Turquoise-crowned Hummingbird
tanager sp. (Thraupidae sp.)
greenlet sp.
pheasant sp.
antvireo sp.
large toucan sp.
Sulphur-rumped/Black-tailed Flycatcher
estrildid finch sp.
Eurasian/American Goshawk
oystercatcher sp.
Mourning/Zenaida Dove
Haliaeetus/Icthyophaga sp.
Furnariid sp.
Lucifer/Beautiful Hummingbird
Arctic/Pacific Loon
Fawn-throated/Ochre-throated Foliage-gleaner
Boreal/Northern Saw-whet Owl
Ring-necked/Green Pheasant
Common/Short-billed Gull
American/Greater Flamingo
antshrike sp.
Burhinus sp.
Ruddy/White-throated Crake
Leach's/Townsend's Storm-Petrel
pygmy-owl/saw-whet owl sp.
Dusky/Broad-billed Hummingbird
Snow/McKay's Bunting
Cory's/Great Shearwater
Western Cattle/Yellow-billed Egret
Sharp-tailed/Pectoral Sandpiper
Clay-colored/Brewer's Sparrow
Red-eyed/Yellow-green Vireo
Campephilus sp./Lineated Woodpecker
LeConte's/Nelson's Sparrow
Common/Spotted Sandpiper
Streptoprocne sp.
Purple/Rock Sandpiper
Common/Antillean Nighthawk
Shiny/Brown-headed Cowbird
Cantorchilus sp.
Leach's/Townsend's Storm-Petrel (white-rumped)
Gray-tailed/Wandering Tattler
Hen/Northern Harrier
Pallas's/Reed Bunting
Connecticut/MacGillivray's/Mourning Warbler
Brown/Black Noddy
flamingo sp.
Phylloscopus sp.
Oceanites sp.
Long-tailed/Pomarine Jaeger
Red-necked/Little Stint
sand-plover sp.
Mexican/Transvolcanic Jay
Psittacula sp.
Aulacorhynchus sp.
Spotted/Barred Owl
Cory's/Cape Verde Shearwater
Xiphorhynchus sp.
Common/Oriental Cuckoo
Taiga/Tundra Bean-Goose
Euplectes sp.
tiger-heron sp.
Emberiza sp.
old world quail sp.
Ramphocelus sp.
small bittern sp.
elaenia sp. (genus Myiopagis)
Spizaetus sp.
Red-eyed/Black-whiskered Vireo
forest-falcon sp.
Myiobius sp.
large albatross sp.
Brotogeris sp.
harrier sp.
Common/Black Scoter
Guatemalan/Mistletoe Tyrannulet
Oriental/Eurasian Magpie
Galapagos/Hawaiian Petrel (Dark-rumped Petrel)
Basileuterus sp.
whydah sp.
corella/white cockatoo sp.
Grasshopper/Henslow's Sparrow
Chlidonias sp.
wood-quail sp.
Shining/Red-legged Honeycreeper
Great Blue/Cocoi Heron
Little/Least Tern
spadebill sp.
lapwing sp.
Scarlet-fronted/Cordilleran Parakeet
old world warbler sp.
Tundra/Whooper Swan
stilt/avocet sp.
lovebird sp.
Cookilaria petrel sp.
Cuban/Caribbean/Sinaloa Martin (Snowy-bellied Martin)
Rufous-capped/Chestnut-capped Warbler
Zosterops sp.
Greater/Lesser White-fronted Goose
Dusky/Turquoise-crowned Hummingbird
Tangara/Stilpnia sp.
swamphen sp.
Cracidae sp.
Tree/Olive-backed Pipit
blue cotinga sp.
Saucerottia sp.
Red-legged/Rock Partridge
Black-throated Gray/Townsend's/Hermit Warbler
potoo sp.
Hydrobates sp. (Band-rumped complex)
Ruddy/Short-billed Pigeon
Velvet/White-winged/Stejneger's Scoter
Great/Medium Egret
Yellow-browed/Hume's Warbler
Yellow-billed/Pearly-breasted Cuckoo
Yellow-legged/Lesser Black-backed Gull
small albatross sp.
Ploceus sp.
Japanese Leaf/Arctic/Kamchatka Leaf Warbler
Bank Swallow/Pale Martin
Arctic/Kamchatka Leaf Warbler
francolin/spurfowl sp.
Forpus sp.
Gray-streaked/Dark-sided Flycatcher
Common/Rain Quail
Lonchura sp.
Grallaria sp.
Red-shouldered/Tawny-shouldered Blackbird
Rock/Hill Pigeon
Riccordia/Cynanthus/Chlorostilbon sp.
stripe-headed brushfinch sp.
neotropical Strix sp.
Northern/Great Gray Shrike
troupial sp.
Zimmerius sp.
paradise-whydah sp.
Eurasian/Burmese Collared-Dove
Dendrocolaptes sp.
Fischer's/Yellow-collared Lovebird
Vidua sp.
Serinus sp.
Scarlet/Red-and-green Macaw
cordonbleu sp.
waxbill sp.
Crypturellus sp.
Greater/Gunnison Sage-Grouse
Dendrocincla sp.
Western/Eastern Yellow Wagtail
Atlantic/Indian Yellow-nosed Albatross
Trindade/Herald Petrel
flowerpiercer sp.
White-capped/Salvin's/Chatham Albatross
Eurasian/Oriental Skylark
Siberian/Amur Stonechat
Red/Black Kite
Brown/Gray Trembler
Dusky/Naumann's Thrush
Snowy/Kentish Plover
rainbow lorikeet sp.
Timaliidae sp.
Snowy/Tristan/Antipodean Albatross
hornbill sp.
Whimbrel/Eurasian Curlew