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Original image copyright: Ross Walker (Ohmi Finch) 近江フィンチ
|Species:||Owl Finch — カノコスズメ|
|Common names:||Owl Finch, Bicheno Finch, Double-bar finch, Clown finch|
|Mutation:||Cinnamon — シナモン|
|Gender:||Hen — 雌|
|Split ring number:||27|
|Closed ring code:||2017-JPN-C024|
|DB item code:||46445|
(for the bird pictured above):
The Cinnamon mutation is sex-linked. This hen is the offspring of a split-cinnamon cock and a normal hen.
|General mutation notes:||The Cinnamon mutation is sex-linked recessive, so hens cannot be split to Cinnamon (while cocks can). It is possible that this mutation is the same as the Fawn mutation in other countries.|
|General species notes:||The sexes are nearly identical. Most of the visual clues have been "educated guesses" at best for me. The most reliable method of sexing has been to wait for the males to sing their courtship song. Some of the visual clues include: the thickness of the breast bar, the width of the crown and the whiteness of the face mask. In males the breast bar is said to be thicker, the crown of the head wider and the face and upper breast whiter than the females. All of these methods are more reliable if you have a number of birds to look at and compare. Just trying it with one pair is difficult unless you've seen a lot of Owl finches.|
There is one subspecies listed for the Owl, T. b. annulosa, or the Black-rumped Owl finch. The only difference that survives of this subspecies in aviculture is the black rump coloration which is autosomal recessive to the nominate form. In the wild there are some other differences in size and tail length, but these have been lost in the crosses with the nominate white-rumped variety. Birds that are the result of a white-rump crossed with a black-rump will show some mottling of the rump color. These birds hold the recessive gene for the black-rump coloration. These birds can then be crossed with other birds showing this mottling or to Black-rumped Owls to produce more of the black-rump color.
Data source: http://www.efinch.com/species/owl.htm