I've been thinking about this for a while now..
about how all creatures split symmetrically which is obvious enough but even more through facial mutations. i think that the "centre point" of this symmetry is crucial focal point for something, who know's what though
funny how the world works. here's some examples of animals who have more than one face...
2 FACED KITTEN
2 HEADED TURTLE
2 HEADED PIG
Two-Headed Piglet - Watch the top videos of the week here
2 HEADED SNAKE
i'll spare you all the human pictures... but this seems to cross all species..