First Japanese records of crosses between Whistling Cygnus columbianus columbianus and Bewick's Swans C. c. bewickii

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Shiro Mikami

Abstract

'Crossed' families of Bewick's and Whistling Swans were observed four times. Three of four were between 'Darky' Bewick's and Whistling Swans and the other between a 'Yellowneb' Bewick's and a Whistling Swan. The bill patterns of juveniles varied but were intermediate types of the two subspecies.

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Mikami, S. (1989). First Japanese records of crosses between Whistling Cygnus columbianus columbianus and Bewick’s Swans C. c. bewickii. Wildfowl, 131–133. Retrieved from https://tidsskrift.dk/Wildfowl/article/view/154009
Issue
Wildfowl 40
Section
Standard Papers

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