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"It looks like, as far as we can tell from the DNA, there is only evidence of two species in North America," Dr Alan Cooper from the University of Adelaide, Australia, told the BBC News website.
"We think that, in fact, people have been looking at these fossils and over-interpreting signs of changes in shape and size," he added.
"Probably these animals are adapting to local environments and perhaps they are [anatomically] more [changeable] than the palaeontologists had perhaps thought."
But new DNA analysis suggests that there were only really three or four species and they evolved rather recently from a common American ancestor, said Jaco Weinstock of the University of Oxford.
Originally posted by beforebc
Why is there such a cover-up involving the horse? Exposing the Columbus Myth by following the horse