New to boas but not snakes need help with Young red tail

[dannybgoode]

Reasonably up to date photo of Aunty Rachel attached for reference.

[Mad Max]

Your snake does look like a Central American, but it's much smaller than mine is. He's 21 months old and starting to top out at 4.5 feet. I think the shape of your snake's face reminds me more of my snake at a younger age too.

I always used string to measure the widest point of my boa and then I made sure that the dead prey item was slightly narrower than he was. I never saw any scale separation that way, which is indeed a topic in the book that Bigsnakegirl mentioned.