There was a guest post on Biologos in 2017 called
The Elimination of Intermediate Varieties: How Evolution Lays the Groundwork for Assigning Rights
The original post doesn’t seem to be accessible, but the discussion is still there. I found the post very disturbing and so did several others. The poster claimed there were "non-personal Homo sapiens animal” around at one time alongside “real” humans, as well as other racist ideas.