Hatchling Questions

[Bogertophis]

I'd keep trying frozen thawed, what temp are you getting them too before you offer it? Also if it's eating adult mice I wouldn't call it a hatchling anymore, it's more than likely a juvenile at this point. I've found males to be more difficult when it comes to feeding unfortunately but rest assured that if your snake is actually hungry they will not reject food frozen thawed or live, they will eat.

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The OP did say it's a hatchling. By "small live adult" they probably (& hopefully) meant a "hopper" mouse, and that is what hatchling BPs are normally fed, unless they're unusually small.