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Introduction and History about the Dimorphic (Mosaic) Canary Around the year 1942 the mosaic factor arose for the first time in Italy. At the beginning, but also nowadays is the naming Dimorphic Canary common, however in many countries is the term Mosaic Canary used for this appearance. In 1946 the first mosaic canaries were exhibited in Eindhoven (Netherland) by the breeder van Son W. According to a report it should have been one mosaic male and one mosaic female. According to some other reports for many years was assumed that only canary females with dimorphic (mosaic) features existed  and first in the 1970s (probably 1976) also canaries with identifiable male and female mosaic characteristics were occured. Whether the mosaic factor is a classical mutation or not, because the factor arose through the transfer of a foreign gene by a hybridization between the Red siskin (Spinus cucullata) is always gladly a discussion point. After the transfer of the "red colour gene" from the red siskin into the canary is the mosaic factor the second story of a genetically engineered animal - also from the red siskin into the canary. (read also...> BEGINNER GUIDE TO GENETICS, MUTATIONS AND COMBINATIONS IN THE CANARY BREEDING)
Fact is that the mosaic factor is proven sex-linked recessive inherited, however with an intermediate character. That means, the mosaic features inherited sex-linked, however some factors exert their influence to make the pattern visible. The mosaic pattern can only be visible in non-intensive (or buff also called frosted) canaries. It should be noted that the mosaic features (pattern) is covered by:  -    Intensive canaries  -    Dominant white canaries  -    Recessive white canaries This not mean that the mosaic features cannot bred in the 3 mentioned cases, the pattern are only not visible, but can be moved. That means that the mosaic factor can be bred in all ground colours, in lipochrome or melanin and also combined with any mutation, such as the classical or non-classical melanin mutations. In the first years after the occurrence, the mosaic factor was only bred in lipochrome canaries. In the last recent years enthusiastic canary breeder developed the mosaic factor also in melanin canaries and that with much success and recognition. Due to the combination possibilities with all the melanin mutations many beautiful canaries appearances arose – truly a FASCINATION OF MOSAIC CANARIES. 
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Red Agate Opal Mosaic Type II
Red Eumo Mosaic Type II