We just received another email from near Manchester also missing a male. Apparently, it was attacked by a dog. Is this the same area that you are referring? If so, then this may be the reason that the male is missing. Finally, if there are no eggs in the nest, is there a possibility that the missing swan is the female?

Another possibility is that if the pair has not be successful in producing a brood, they may look for another mate. The Regal Swan