Since the cygnets do not have mature sexual organs, probing is not a reliable means to determine gender. The most reliable test is to submit a feather to a reputable veterinary DNA Sequencing laboratory. The cygnet must be identified in some way prior to the testing so that you know which cygnet has been tested. Mini-microchipping or a temporary band may be possible. You will need to check with your local avian/waterfowl veterinarian to see which identification system they would recommend. The Regal Swan
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