ATLANTA, Georgia (CNN) -- The Bigfoot in the freezer is made of rubber, a Web posting asserted Tuesday.

The initial promoter of two hikers' claim that they found the body of Bigfoot in Georgia said he has determined that the discovery was a hoax.

The body turned out to be rubber, and the two men who claimed that they found it, Matthew Whitton and Rick Dyer, have admitted that it was a costume, said a posting Tuesday on the Web sites of Searching for Bigfoot Inc. and Squatchdetective.

The posting purportedly was written by Steve Kulls, who maintains the Squatchdetective Web site and hosts a similarly named Internet radio program, where the find was announced weeks ago.

In addition, Stanford University anthropologist Richard Klein said Monday that he was not aware he had been identified as participating in the project and would not be involved in any effort to examine the purported Bigfoot carcass.