"Showing that picture and telling me (or anybody else) that that's the way I probably think is kind of rude."
Actually, I would have given a very similar answer if I had read this thread earlier. You might see it as rude for us to assume that's what you meant, but it's what your post communicated to me, as well. Just so you know. I didn't see it as ridicule, either, just an explanation of the basic fallacy that I (and others) read into your post.
As to your follow-up questions,
the Wikipedia entry on "speciation" is a good little intro on ways new species arise - look over the discussion of allopatric, sympatric, etc. speciation.