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

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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