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We would suggest you round up all the males except the male parent. Place all of the other male swans in an area that they cannot get to the nest or the parents. Keep them separated for several months until the cygnets grow in size and can escape any chasing from the males as they may seriously injure or kill the cygnets. You want to give the parents time to rest and bond with the new cygnets so they can adequately protect their young. Just ensure that the male parent is identified and not separated from its family. The Regal Swan