These super flexible predators are very unique. The ferret has a well-adopted body design, the flexibility in the ferret is due to a unique position of back vertebrae. In other mammals, the protrusion on each section of the spine stops it from moving too far. In ferrets, these protrusiona are more tenuous, and create flexibility and mobility. Their spines can essentially spread out when the ferret travels in a pipe or underground, thus increasing their body length by up to 30%! That's a pretty …