Introduction.
Much has been written and spoken about red-factored canary birds — with proponents and opponents. The discussions concern their naturalness and whether it is harmful to the birds. Also at exhibitions you regularly hear the comment "red ownership is not even". Reason enough to revisit this topic, paying attention to the pros and cons, if there are any. In recent years, beautiful, fully colored red factor birds have been able to be admired. Origin of the red factor.
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