The mutation for the Devon Rex appeared in the adjoining county of Devon ten years after the Cornish Rex. The mutation is dissimilar and so when matedtogether they produced normal-coated kittens. The shape of the head is also particular to the Devon Rex. The CFA. Standard defines it as a wedge which, from the front, forms three distinct curves: the outer edge of the ears, the cheekbones, and the whisker pads. With its big eyes and large ears it is appropriately described as having an 'elfin look'.