Regarding the kenyan- Male kenyan sand boas often eat less after ~1-1.5 yrs of age. I have had adult male kenyans go off feed for 7 months! I am not sure where you are located, but most likely the weather outside has cooled down? Maybe there is a cool draft, etc... They moving them to a different location and try turning up the temps a little.

Don't stress this yet.

-Chris
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Christopher E. Smith
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