I have bred Brazilian rainbow boas for the last few years. My remaining 2023s, which are 10 months old at this point, are roughly 24" long and 3/4" - 1" in diameter, and around 80 grams in weight (I just pulled one out and measured). I'm currently feeding one fuzzy mouse (which is from 4-6 grams) once per 7 days, and I may bump them up to a hopper mouse on the same schedule somewhat soon but I'm not in any rush to do that.
This is the sort of feeding size and schedule my past growouts have been on, and seem to do fine with it. Given that they're semi-arboreal, I don't push large food on them (though they would eat it, I'm sure), and like most of my snakes I aim for adulthood/breeding size at about four to five years of age.
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