I've also noticed that my baby balls grow faster on rats, but couldn't definitively tell you why. I suspect part of the reason is that when we eyeball the rodent, we're probably offering a mouse that is smaller than necessary. (A fuzzy rat may actually be a bit bigger than a hopper mouse, for example).
Also, baby ball pythons outgrow mice pretty rapidly, in far less than a year if they're well fed.
That said, I breed both, because baby balls also seem to start feeding more readily on mice, and mice are more prolific in a smaller area.
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