Boy am I talking alot tonight. We can thank Red Bull for that. Brumation is a multi-faceted phenomena that incorporates such nuances as type of specie and subspecie in question for brumation, the range that they are indigenous to, etc. for example, one would not brumate an African python the same as for a Northern pine snake. The requirements are different for these and everything else that falls in-between. Mexican black kings range in areas that do not experience drastic winters, but rather a more reasonable cooling period. I have bred these kings at a cooling temperature ranging between 55F to 65F within a three month period with much success (as there occurs temperature fluctuations in wild settings of course, causing some stirring of the snakes but which is not of ill concern. It is recommended to "check-in" on them periodically to ensure their well-being), as did I with other species that come from warmer climates such as California kings and T.P. ratsnakes for example. More temperate climate species, such as N.A. milks and montane kings for example, would do better brumating at colder temps with some reasonable fluctuation factors (45 - 60F). Some may disagree with this common practice, but under most captive conditions this has been the gold standard I believe.

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Jerry Kruse 
"One often meets his destiny on the path he takes to avoid it". - Master Oogway