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caring boa constrictor?
i got a new boa C. 3 years old 1.6 meter long. can anyone tell me how to care lighting, temperature ,humidity,food and ...?
how can i sex it?
how can i found out it's Constrictor constrictor or Constrictor imperatur?
The ideal temperatures in my opinion are:
78F cool end, 80F to 85F ambiant and 90F in the basking area. Try not to let the temperature drop below 75F at night and temperatures being too low and cause problems with the Snakes Respitatory System, and when you have a Respiratory Intection on your hands, it can be a real problem and lots of money to sort out! 
My Boa's humidity is rought 60 - 65% but with it being a big heavy bodied Snake, Boa's can cope with varying humidity a lot better than a smaller Snake could. Saying that, you shouldnt let your tank go bone dry or extremely humid, as again this could have an effect on the Snakes Respiratory System.
A heat light is definately reccomended, in order to give your Snake an ideal basking site, but always make sure it's protected as the Snake could go too close to the light and burn it's self. Heat mats arent really reccomended for large Boa's, and they can cause Scale Rot, which again, isn't too great! Plus if your snake urinates on the mat whilst it's on, and lies on it, it can cause a NASTY acid burn on your Snake. UV lighting isn't required at all.
Substrate is important, personally i use newspaper, sure it's unattractive to look at, but it's easy to clean safe and inexpensive to change! Aspen is a good choice too, it's nice to look at, but the dust off it can cause Respiratory Infections, which unfortunately is what happened to mine Aspen is also expensive usually too, which isnt good Never use Sawdust for substrate, it can get between their scales and cause huge problems, never good!
Food, well it's best to feed your Snake on Defrosted Large Mice or Rats. Depending on how big your Snake is, you'll either feed it Large Mice, or Small Rats. I have 2 Common Boa's, one is 2 meters long, another is 2.6 meters long, and they both feed on Large Rats, Gunie Pigs and Rabbits, all frozen/thawed. Try not to feed live food as this can cause HUGE problems for your snake if the prey attacks your snakes. A simple bite and develop into septacemia, which is NOT good.
Sexing should be done by a proper qualified veternarian, it's usually done by probing your Snake, i'd suggest googling "Snake Probing" if you want to learn more, but doing it yourself can seriously harm your Snake!
Common Boa Constrictors, or Boa Constrictor Imperator are pretty much similar to a Boa Constrictor Constrictor, they're usually lighter coloured than the BCC, and on the whole slightly smaller too. Boa Contrictor Imperator usually have a Brownish coloured tail rather than the Red of a BCC, they're pretty much the same in every other department.
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