It was originally described by Henry Fairfield Osborn in 1922, on the basis of a tooth found by rancher and geologist Harold Cook in Nebraska in 1917.
The tooth had been found years prior in the Upper Snake Creek beds of Nebraska along with other fossils typical of North America.
According to these discovered pieces, the tooth belonged neither to a man nor an ape, but to a fossil of an extinct species of peccary called Prosthennops.
[3] Although the identity of H. haroldcookii did not achieve general acceptance in the scientific community,[2] and the purported species was retracted half a decade after the original article had been published by Osborn, creationists have promoted the episode as an example of the scientific errors that can undermine the credibility of paleontology and hominid evolution theories, and how such information is peer-reviewed or accepted as mainstream knowledge.
[4][5] During the same time period as the discovery and examination of the tooth, the teaching of evolution in public schools was under fire in the Scopes trial.