When pigs fly puzzle, final test

Continuing the discussion from [Community Puzzle] When pigs fly:

I still don’t follow this. Do the rules explain how we can deduce the existence of “GEESE with TOENAILS”? It seemed reasonably clear to me that only pure “Object” categories would be guaranteed to be non-empty, as the mere existence of some combination of attributes shouldn’t imply the existence of individuals that meet all of those attributes. In retrospect, I gather that that’s not the intent.

So, does the fact that “GEESE with TOENAILS” is mentioned on the left-hand side of an “are” statement imply that some member of such a set exists? Would it be the same if it were on the right? Has anyone else worked on this puzzle since then?

A post was merged into an existing topic: [Community Puzzle] When pigs fly