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
628.
species
630.
species
649.
species
650.
species
651.
species
670.
species
708.
species
714.
species
730.
species
753.
species
757.
species
762.
species
764.
species
799.
species
803.
species
826.
species
858.
species
860.
species
896.
species
900.
species
917.
species
919.
species
941.
species
961.
species
973.
species
991.
species
998.
species
1015.
species
1016.
species
1038.
species
1067.
species
1085.
species
1091.
species
1094.
species
1099.
species
1119.
species
1152.
species
1161.
species
1162.
species
1164.
species
1165.
species
1166.
species
1170.
species
1180.
species
1181.
species
1183.
species
1188.
species
1225.
species
1243.
species
1244.
species
1246.
species
1247.
species
1249.
species
1252.
species
1265.
species
1270.
species
1271.
species
1280.
species
1301.
species
1307.
species
1308.
species
1309.
species
1310.
species
1315.
species
1327.
species
1330.
species
1337.
species
1343.
species
1359.
species
1362.
species
1365.
species
1371.
species
1372.
species
1376.
species
1379.
species
1431.
species
1443.
species
1456.
species
1465.
species
1466.
species
1467.
species
1474.
species
1476.
species
1477.
species
1479.
species
1482.
species
1487.
species
1490.
species
1492.
species
1497.
species
1502.
species
1504.
species
1511.
species
1512.
species
1537.
species
1548.
species
1549.
species
1551.
species
1554.
species
1557.
species
1558.
species
1564.
species
1567.
species
1580.
species
1588.
species
1593.
species
1594.
species
1595.
species
1597.
species
1606.
species
1608.
species
1609.
species
1620.
species
1624.
species
1625.
species
1629.
species
1630.
species
1643.
species
1645.
species
1646.
species
1650.
species
1652.
species
1657.
species
1659.
species
1667.
species
1669.
species
1674.
species
1676.
species
1677.
species
1678.
species
1679.
species
1680.
species
1681.
species
1694.
species
1696.
species
1702.
species
1711.
species
1712.
species
1714.
species
1715.
species
1717.
species
1718.
species
1719.
species
1720.
species
1721.
species
1722.
species
1723.
species
1724.
species
1725.
species
1727.
species
1728.
species
1731.
species
1733.
species
1737.
species
1738.
species
1739.
species
1740.
species
1743.
species
1744.
species
1746.
species
1747.
species
1748.
species
1750.
species
1751.
species
1752.
species
1754.
species
1755.
species
1756.
species
1762.
species
1766.
species
1768.
species
1769.
species
1771.
species
1772.
species
1773.
species
1774.
species
1775.
species
1778.
species
1779.
species
1781.
species
1782.
species
1783.
species
1784.
species
1785.
species
1787.
species
1789.
species
1792.
species
1793.
species
1795.
species
1797.
species
1798.
species
1799.
species
1802.
species
1804.
species
1805.
species
1806.
species
1807.
species
1808.
species
1813.
species
1814.
species
1815.
species
1817.
species
1818.
species
1820.
species
1821.
species
1822.
species
1823.
species
1824.
species
1827.
species
1829.
species
1832.
species
1833.
species
1834.
species
1839.
species
1840.
species
1841.
species
1842.
species
1843.
species
1844.
species
1846.
species
1849.
species
1852.
species
1855.
species
1857.
species
1858.
species
1860.
species
1861.
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
1876.
species
1877.
species
1878.
species
1879.
species
1880.
species
1881.
species
1882.
species
1884.
species
1885.
species
1886.
species
1888.
species
1889.
species
1890.
species
1891.
species
1892.
species
1893.
species
1894.
species
1895.
species
1896.
species
1897.
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
1919.
species
1920.
species
1921.
species
1922.
species
1923.
species
1924.
species
1925.
species
1926.
species
1927.
species
1928.
species
1929.
species
1930.
species
1931.
species
1932.
species
1933.
species
1934.
species
1935.
species
1936.
species
1938.
species
1939.
species
1940.
species
1941.
species
1942.
species
1943.
species
1944.
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
1981.
species
1982.
species
1983.
species
1984.
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
2033.
species
2034.
species
2035.
species
2036.
species
2037.
species
2039.
species
2040.
species
2041.
species
2042.
species
2043.
species
2044.
species
2045.
species
2046.
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
2069.
species
2070.
species
2071.
species
2072.
species
2073.
species
2074.
species
2075.
species
2076.
species
2077.
species
2078.
species
2079.
species
2080.
species
2081.
species
2082.
species
2083.
species
2084.
species
2085.
species
2087.
species
2088.
species
2090.
species
2091.
species
2092.
species
2093.
species
2094.
species
2096.
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
2110.
species
2111.
species
2112.
species
2113.
species
2114.
species
2115.
species
2116.
species
2117.
species
2118.
species
2119.
species
2120.
species
2121.
species
2124.
species
2125.
species
2126.
species
2127.
species
2128.
species
2129.
species
2130.
species
2131.
species
2132.
species
2133.
species
2134.
species
2135.
species
2136.
species
2137.
species
2140.
species
2141.
species
2142.
species
2143.
species
2144.
species
2145.
species
2146.
species
2147.
species
2148.
species
2149.
species
2150.
species
2151.
species
2152.
species
2153.
species
2154.
species
2155.
species
2156.
species
2157.
species
2158.
species
2159.
species
2160.
species
2161.
species
2162.
species
2163.
species
2164.
species
2165.
species
2166.
species
2167.
species
2168.
species
2191.
species
2195.
species
2197.
species
2198.
species
2199.
species
2200.
species
2201.
species
2202.
species
2203.
species
2204.
species
2205.
species
2206.
species
2207.
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)
Mallard x Hawaiian Duck (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 x Salmon-crested Cockatoo (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)
Laysan x Black-footed Albatross (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)
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
Red-whiskered/Red-vented Bulbul
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
procellariid sp.
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
Lonchura sp.
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
Long-tailed/Parasitic Jaeger
Little/Least Tern
Pterodroma sp.
Ring-necked/Green Pheasant
Tachycineta sp.
Oak/Juniper Titmouse (Plain Titmouse)
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)
Dark-eyed Junco/Pine Warbler
hawaiian honeycreeper sp.
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
Cookilaria petrel sp.
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
estrildid finch sp.
Striated/Green Heron
Yellow-footed/Western Gull
jaeger/skua sp.
eclectus sp.
Scripps's/Guadalupe/Craveri's Murrelet
Eastern/Mexican Whip-poor-will
storm-petrel sp. (dark-rumped)
King/Common Eider
myna/starling sp.
corella/white cockatoo sp.
Pheucticus sp.
Black/Markham's Storm-Petrel
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
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.)
Gray-tailed/Wandering Tattler
greenlet sp.
pheasant sp.
antvireo sp.
large toucan sp.
Sulphur-rumped/Black-tailed Flycatcher
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
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
Thraupidae sp.
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)
Hen/Northern Harrier
Pallas's/Reed Bunting
Connecticut/MacGillivray's/Mourning Warbler
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.
Grasshopper/Henslow's Sparrow
Chlidonias sp.
wood-quail sp.
Shining/Red-legged Honeycreeper
Great Blue/Cocoi Heron
spadebill sp.
lapwing sp.
Scarlet-fronted/Cordilleran Parakeet
old world warbler sp.
Tundra/Whooper Swan
stilt/avocet sp.
lovebird sp.
Cuban/Caribbean/Sinaloa Martin (Snowy-bellied Martin)
Rufous-capped/Chestnut-capped Warbler
Red-billed/Red-tailed Tropicbird
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
Forpus sp.
Gray-streaked/Dark-sided Flycatcher
Common/Rain Quail
Far Eastern/Eurasian Curlew
Grallaria sp.
Red-shouldered/Tawny-shouldered Blackbird
Rock/Hill Pigeon
white-eye sp.
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
waxbill sp.
Dendrocolaptes sp.
Fischer's/Yellow-collared Lovebird
Vidua sp.
Serinus sp.
Scarlet/Red-and-green Macaw
cordonbleu 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
