Creeper chickens

Creeper chickens are characterised by abnormally short legs, so short that the body is carried a few centimetres from the ground. This chondrodystrophy is caused by a recessive lethal allele, "Cp". A number of breeds display the characteristic, among them the Chabo and Jitokku breeds of Japan, the Courte-pattes of France, the Krüper of Germany, the Luttehøns of Denmark, and the Scots Dumpy.
The creeper gene.
The creeper gene "Cp" was described by Cutler 1925, and confirmed by Landauer and Dunn in 1930; the symbol "Cp" was assigned to it by Hutt in 1933. It was shown to be present in the Chabo by Landauer in 1942, and in the Jitokko by Shibuya in 1972.