There are a smurfload of monsters in Final Fantasy VII. We see that Shinra are responsible for creating some monsters in the Nibelheim reactor, and I believe there is talk of Mako leaks making animals mutate and what not. But Professor Gast and Ifalna add another source to the mix: they are the Cetra, mutated by (presumably) Jenova's cells.
So we have three possible sources of monsters. Is there any discernible way to distinguish them? Are they all legitimate? Could each process have created similar monsters? I HAVE SO MANY QUESTIONS AND FINAL FANTASY VII DOESN'T HAVE A 'THEY CAME FROM THE MOON' SIMPLE ANSWER.
Attachment 49449