Hi,
Dinkers are simply unproven traits that you want to see if you can reproduce or enhance etc. If you find a nice normal that you think looks a bit "different" and you really like the look you might spend ages trying to see if it can be passed on through breeding - through multiple generations if you think it might be a recessive trait.
Ringers are explained in this thread in the hunters guide series.
You can find more in the series listed here.
dr del
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