| Why do bird keepers fit split rings to their birds?
In addition to closed rings many bird keepers use split rings for various reasons:
1. For a quick visual indicator - Java Sparrow's are monomorphic in appearence, in other words, both sexes look the same. When I have a young Java's in my flight cage I find it easier to single out a young cock bird I hear singing for the first time by logging the colour of his split ring.
2. To identify bloodlines - Many breeders will use specific coloured split rings that correspond with their various bloodlines.
3. Alternative to closed ringing - There are many breeders who choose not to close ring their birds (they may find it difficult or they may not agree with close ringing). Split rings are available with letters and numbers, however, these rings cannot be trusted to guarantee the age of a bird due to the ease of changing them.
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