What do we do with this literature on hybrids then?
Gray Hawk Asturina nitida and Red shouldered Hawk Buteo lineatus
Lasley G. W. , Sexton C.
Title The spring season March 1 - May 31, 1989. Texas region
Editor -- Journal American Birds
Common Merganser mergus merganser and Common GoldeneyeBucephalus clangula
Authors Foulkes R. Title Hybrid Goosander x Goldeneye, Audenshaw Reservoirs, 15th January Editor -- Journal Birds In Greater Manchester
Hooded Merganser Lophodytes cucullatus and Bucephala clangula Common Goldeneye
Authors Ball S. C. Title Hybrid ducks, including descriptions of two crosses of Bucephala and Lophodytes Editor Bulletin of the Peabody Museum of Natural History - Yale University - Bulletin 3 - 26pp
Black Crowned Night Heron Nycticorax nycticorax and Tricolored Heron Egretta tricolor
Sibley D. Title Finding and Identifying Hybrid Birds
Editor -- Journal Birding
Yellow Headed Blackbird Xanthocephalus Xanthocephalus
and Brewers Blackbird Euphagus cyanocephalus
Panov E. N. Title Natural hybridisation and ethological isolation in birds [Russian] Editor Nauka, Moskva Journal -- Year Volume Number Starting Page Ending Page
1989 --
Ruffed Grouse Bonasa umbellus and Ring Necked Pheasant
Phasianus colchicus
Sibley C. G. Title The Evolutionary and Taxonomic Significance of Sexual Dimorphism and Hybridization in Birds Editor -- Journal Condor
Year Volume Number Starting Page Ending Page 1957
It might be wise to look at this quote from author Frank B. Gill
The Auk
A Quarterly
Journal of Ornithology
Vol. 115 No. 2 April 1998
The Auk 115(2):281-283, 1998
OVERVIEWS
HYBRIDIZATION IN BIRDS
FRANK B. GILL •
National Audubon Society, 700 Broadway, New •brk, New York 10003, USA
HYBRID.
"The word itself immediately evokes
the powerful concepts of novelty, strength, and
sterility. Hybrids symbolize both inferiority
and superiority. Hybrids violate racial purity
and clan identity. Hybrids challenge breeders,
defy taxonomists, and fascinate ornithologists..."