I talked to the folks at the Exotic Wildlife Association and the informed me that the Dybowski sika are one of the 3 recognized sub-species of sika. These are the, smallest to largest, Japanese, Manchurian/Formosan and Dybowski. The Sika Grande or Silk is a hybrid animal and is a mix based upon breeding a sika to an elk. This Silk is not always easy to distinguish from a true sika unless you are an animal biologist or do the necessary blood testing. However, the EWA did indicate that Silks are not recognized for their record book as did SCI. Charley Seals, the EWA executive director, said that to a trained animal breeder or trophy scorer there are several things that would make one question whether any given animal was a true sika or a hybrid. If someone tries to enter an animal into their record book and there is any doubt then they insist that the necessary testing be done to insure the validity of the entry.