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Hybridisation in terns : ウィキペディア英語版 | Hybridisation in terns Hybridisation in terns is not as frequent as in gulls; however, some mixed pairings have been noted. ==Marsh terns==
Hybridisation between white-winged black tern and black tern has been recorded from Sweden〔 Alexandersson, H. (1979) En hybridisering mellan vitvingad tärna ''Childonias leucopterus'' och svarttärna ''Childonias niger'' på Öland 1978 ''Calidris'' 8: 151-53〕 and the Netherlands.〔 Van IJzendoorn, E. J. (1980) Broedgeval van Zwarte ''Childonias niger'' × Witvleugelstern ''C. leucopterus'' ''Dutch Birding'' 2: 62-65〕 Two juvenile birds at Chew Valley Lake, England, in September 1978 and September 1981, were also believed to be hybrids; they showed mixed characters of the two species, specifically a combination of a dark mantle (a feature of white-winged black) with dark patches on the breast-side (a feature of black tern, not shown by white-winged black).〔Vinicombe, Keith (1980) Tern showing mixed characters of Black Tern and White-winged Black Tern ''British Birds'' 73(5): 223-25〕〔Davis, A. H. (1980) Tern showing mixed characters of Black and White-winged Black Tern ''British Birds'' 75(12): 579-80〕
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