I've done it. I raised my first two up together, two females. Fantastic animals. Grew faster than I ever would have guessed and got larger than I would have guessed. Pyros are slight in build but sure can get larger than most zonata. During early Spring, the two of them went through 6 small mice at one sitting.
The secret for babies is moisture. Well, and heat. They use heat like any other kingsnake - they just like a cooler area too. But the above is true of any king/milk pretty much. Babies dehydrate easily, and when they do, they just want to burrow down and not feed. FR already said this - it is good to listen to this kind of info. So has Osborne and others. Osborne (and others) used this technique for graybands, pyros, ruthveni, etc. Keep them hydrated and you have a better chance of a great feeding baby. I was fortunate to see Osborne's setup and learned from it. Makes so much sense. Deli cup, lid with a hole or cutout and moss. Place cup partially over the heat. Simple, easy, effective. Or my method, 3/4 or 1 inch PVC pipe (one end over the heat) and some water sprayed in occasionally. I feed them right in the pipe. All good for young pyros, sinaloans, whatever. Cal kings seem to not care as much, but Cal kings and the larger getula have thicker skin. (Cals eat anything almost anytime even if you jump up and down right in front of them, swing your arms and make faces at them. Not that I've tried
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Mark