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Re: marginal differences

> Some of it probably is individual variation.  The number of recognised
> _Triceratops_ species has fluctuated between one and nine at different
> times,

There were even times, like 20 years ago, when people tended to stop
counting at 16.

> with two currently looking popular.

Yes. The question is 2 or 1 (*T. horridus* and *T. prorsus* or only the