Sully and Susie Cygnets

OK, the four cygnets of Sully and Susie are ready for their holding pen where an avian veterinarian will draw blood for DNA analysis to determine gender.  At this young age, their reproductive attributes are not sufficiently developed to tell a male from a female.  An experienced observer can make an educated guess based on behavior, but that's not good enough when pairing requires certainty.



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