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The Sex-linked (SL) Clearbody budgerigar mutation is one of approximately 30 mutations affecting the colour of budgerigars. It is the underlying mutation of the Texas Clearbody variety. Over the years many mutations have been reported which produce a (relatively) clear yellow or white body with normal black or dark wing markings, approximating to the beautiful painting of a (hypothetical) "laced Yellow" by R A Vowles shown in Dr M D S Armour's book, ''"Exhibition Budgerigars"'' .〔 〕 In an article published in ''Cage and Aviary Birds''〔 〕 Dr T Daniels summarised those that were known in 1981. Many of these failed to become established, and others, reported separately, may have been the same mutation which appeared in different parts of the world. The Sex-linked Clearbody was one which was established successfully in the USA. == Appearance 〔 〕== In the green series the Sex-linked (Texas) Clearbody has a yellow body with a pale greenish cast, and white in the blue series with a pale bluish cast. The cast is palest on the breast, increasing towards the vent and rump. The variety has normal wing marking in grey-black, off-white to grey flights, a tail rather lighter than usual, and normal violet cheek patches. The appearance is rather similar to the Dominant (Easley) Clearbody, but the normally coloured cheek patches distinguish the Sex-linked (Texas) Clearbody. For photographs of Sex-linked Clearbodies, (see ). == Historical notes == The details of the first appearance of the SL (Texas) Clearbody have been lost, but the Clearbodies being bred by Floyd Guelker in 1958 were probably of this type. The original mutation is thought to have originated in a colony aviary in Texas around 1955.〔 In 1958 Mrs Gay Terraneo of Wilmington and Mr John Papin of Long Beach, both in California, obtained respectively a pair and a hen, and showed that the mutation is a sex-linked recessive. Jeff Attwood brought the variety to Britain in 1989.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sex-linked Clearbody budgerigar mutation」の詳細全文を読む スポンサード リンク
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