Most if not all of the lampropeltis triangulum animals are a bit on the nervous,flighty, spastic side although every individual varies..Most all of the North american animals are of the 3-4 foot size, central american animals will exceed that and the black milk is the largest,the hondurans will hit 5/+ maybe..All are slender in build and won't likely attain the girth/mass of some of the kingsnakes, floridas/chain kings..
Because of Morphs, many are not pure and are a combination of milk..
As far as locales/sub species I'd point you to wikipedia or search engine..
All are generally hardy captives and make for rewarding keeping..
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