http://meta.pets.stackexchange.com/questions/664/species-identification-and-the-help-center was raised when we had this question: What is this reptile/lizard?

Basically, the person had a picture of a monitor and wanted to know what kind it was.

I gave it my best shot, but in trying to answer the question, I found it was extremely non-constructive for this site. It simply didn't work without having a direct link to the person asking the question (aka a discussion).

Today I asked this question: My bearded dragon has stopped growing, is it possible I got a Rankin's dragon?

I believe is on-topic because it's asking for the defining characteristics between a Rankin's and an Inland bearded dragon. It doesn't require a discussion, and an answer will probably be something defining the differences in the jawlines and the forehead. Diagrams can be used, and there should be references that can be found somewhere else online for it. Really the difference is that there's no real guesswork involved, and no participation from the person asking the question needed.

Similarly I think questions could be asked for the difference between two types of bulldogs.

Do we want those kinds of identification questions? Or should we ban-hammer them all? Maybe send them all to Biology.se?