It doesn’t matter where you start. Just start.
http://www.youtube.com/v/KeP36t1Lt8g&rel=1That's really freaky.It's amazing what nature can do sometimes. My brother has, pickled in formaldehyde or something, an 8-legged cat. Effectively it was a pair of conjoined twins which split at the neck. Only one head but two bodies. He's had this specimen in his possession for about 40 years: shortly after him getting his job as a chemist at Hanningfield reservoir, their works cat gave birth to a litter of kittens and this monster was one of them. It didn't survive long.