OK, so what's sufficient evidence? You're "dubious that they have that evidence". What evidence is required, in your opinion, then? Speaking as a layman, my f

OK, so what's sufficient evidence? You're "dubious that they have that evidence". What evidence is required, in your opinion, then? Speaking as a layman, my first guess at a suitable threshold would be: finding a large-enough, different-enough part of a skeleton/whatever that in the past such parts have seldom turned out to be an existing species.