The Clearwing budgerigar mutation is one of approximately 30 mutations affecting the colour of budgerigars. It is the underlying mutation of the Clearwing variety, often known as Yellowwings in the green series and Whitewings in the blue series. When combined with the Greywing mutation the variety is known as the Full-bodied Greywing. When combined with the Yellowface II and Opaline mutations the Rainbow variety is produced. Appearance The Clearwing Light Green has green body feathers only very slightly paler than the normal or wild-type Light Green with highly contrasting yellow wings. The Clearwing Skyblue is similar but with a blue body and white wings. The body colour is a little brighter in tone than the corresponding normal. The wings and mask carry pale grey shadows of the normal markings and spots. In the best show birds these are quite faint, but nevertheless are still clearly visible. The cheek flash, cere and eye are unaffected by this mutation. The long tail feathers are much paler than the wild-type, being smokey-grey in the blue series and a pale grey-green in the green series. Clearwings which are split for Dilute are often slightly paler than pure Clearwings. Historical notes The precise origin of the Clearwing mutation is unclear, but Clearwings almost certainly appeared first among Greywing stock in Australia in the late 1920s. In the 1920s the Greywing was quite a popular variety, far more common than now. Many studs of Greywings were established in both Great Britain and Australia, but there seemed to be differences between the British Greywings and those being bred in Australia. The British variety had soft grey markings and a body colour of about half the normal intensity, whereas some of the Australian 'Greywings' had a body colour of almost normal intensity, together with very pale wing markings. These brighter coloured 'Greywings' were very popular in Australia and were preferred to the more subdued shades of the true Greywing. In the mid-1930s there was considerable debate about the nature of these brighter Australian 'Greywings', some maintaining that they were a distinct mutation and others insisting that they were obtained by selective breeding from normal Greywings and/or Dilutes. The 'Greywings' with almost full body colour and light wing markings were known throughout Australia as Jades in the green series and Royals in the blue series. The latter name originated from a pair of 'Greywing' Cobalts (of the type with