Fergie, I assume you've never hatched eastern kings. They are notoriously difficult to get started on rodents. They naturally prefer snakes, lizards, and frogs, and scenting is required about 90% of the time. Even then, there is a large percentage that only wants snakes for their first few meals. I'm not saying these won't be ferocious feeders as adults, but they are the most problematic common king to get feeding on rodents.
I will agree with you on the graybands. I have several graybands and so far, my hatchlings have even refused live baby skinks. They seem to be species specific to certain lizards native to their habitat. I will just cool them for a month or so and see what happens.
As for aggressive feeders, nothing beats the Florida/Brooksi kings or Goini kings. They are the garbage disposals of any collection. My favorite kings for nearly 20 years.
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