Silkie the "SHH" gene, called the ZPA Regulatory Sequence (ZRS). This causes ectopic "SHH" expression in the anterior of the developing limb bud, leading to increased tissue growth and digits. While the feet of the Silkie display polydactyly, the wings have the standard tridactyly (three digit) arrangement. The Japanese Silkie initially develops additional digits in the wing as an embryo, but these are lost prior to hatching. The genetic cause behind Silkie polydactyly differs from those that cause polydactyly in the Dorking chicken breed, which is due to ectopic "FGF4" expression in the AER, with ectopic "SHH" a secondary effect. The
Foundling-Bird Foundling-Bird Foundling-Bird is a German fairy tale collected by the Brothers Grimm, number 51. It is Aarne–Thompson type 313A, the girl helps the hero flee, and revolves about a transformation chase. Others of the type include "The Master Maid", "The Water Nixie", "Nix Nought Nothing", and "The Two Kings' Children". A forester found a baby in a bird's nest and brought him back to be raised with his daughter Lenchen. They called the child Fundevogel or Foundling-Bird, and he and Lenchen loved each other. One day Lenchen saw the cook carrying many buckets of water to the house and asked