I have encountered this problem before. I think it is a very good hypothesis. The snakes even though they are offered food items that are naturally occuring in their own environment will not feed. Although quite expensive it would be interesting to study the genetics of the snakes in question.
In just about every clutch of snake eggs I hatch there seems to be a couple or few that just do not want to feed regardless of what you do. In nature of course it is said that animals only replace themselves.
Jason

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