1. How big do they get?
I have a female that is just shy of 8' and my largest male is a few inches longer than 6'. My point is, that is about average for boht sexes. Although there are bigger of each sex, this is more common.
2. Cage requirements at all sizes?
Allot of breeders keep there boas (adults) in 4' cages. I keep my largest female (the above mentioned one) in a 6' cage I have. I built a few myself and when I parted with my retics, I was going to move them as well, but decided to keep them for two larger females.
3. Feeding from hatchling to adult
I start all my boas on hopper rats unless it is a smaller than average one that can only take mice. No matter the size I feed my snakes something that does not 'gorge' them and create a huge lump. I am one that believes more smaller meals vs. fewer larger ones.
4. How fast they grow
Growth depends on the person raising it. I have heard some swear they have yearlings at 6' and others have 2 year olds at 3 1/2-4'. I think both are an extreme, but that is just my opinion. I have two- 2 year old het albinos that are 4 1/2' (Male) and approx. 5 1/4' (female). I think you will find, if more people answer this question, that this is more common. It also depends on what type of boa you are talking about (BCC, BCI, etc.). The above examples are of BCI's.
5.Are hide boxes nesessary?
Matter of preference, I do not use them myself.
Now a couple questions for you. What have you owned in the past OR currently have? MY opinion is a burm is anot a snake to 'learn' on. Although they can become great pets, they are still large and potentialy dangerous snakes.
If indeed this would be your first snake, I would go with a corn, ball, or good old columbian boa.
Good luck!~
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Brian Oakley
Phoenix, Arizona
BrianOakley@cox.net