Tom:
As I am too lazy to read back in this thread, I am going to guess that the “pig” in question is “Nebraska Man.” Back in the Thirties (I believe) a tooth was found in a deposit of fossils from the invasion of North America by Asian animals. That was when camels and cats came over (IIRC) (the camels moved down to South America and became llamas). The tooth looked like that of an anthropoid ape and was tentatively identified as such. A writer of popular science articles thought it would be more interesting to illustrate it as belonging to a Homo erectus type homonid rather than a pongoid ape. Thus Hesperopithecus became viewed as an erly man.
Within six years, the discoverer of the tooth found more. These were associated with a jawbone, and the jawbone was clearly not a primate, but a peccary. The discoverer promptly wrote up his misidentification, and Hesperopithecus disappeared from the literature except for Creationist tracts.
I have never felt that Hesperopithecus deserved to be mentioned in the same breath as Eoanthropus. Piltdown was a conscious fraud (possibly starting out as a joke, but since we still don’t know for sure who did it we cannot tell). Hesperopithecus was an honest error, corrected by the same person who announced it as soon as further evidence became available.
Dr. Fidelius, Charlatan
Associate Curator Anomalous Paleontology, Miskatonic University
“You cannot reason a man out of a position that he did not use reason to reach.”