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Well, okay then. =D
The "blue racer" and "buttermilk racer" phenotypes of Coluber constrictor can be kinda blue.
Dendrelaphis cyanochloris is really blue.
Boiga cyanea probably counts because some get really blue heads/chins.
Laticauda laticaudata is a good choice
Blue Thamnophis sirtalis and T. sauritus can be pretty blue.
Calliophis bivirgatus has an orange head to contrast the blue, so is particularly striking
Trying to think of what else shows blue
Oh, Orthriophis taeniurus, some populations show kind of a dusky bluish to the whole body, sometimes just a bright blue head.
I guess Philodryas baroni comes in bluish.
If we're really reaching, some of the blues in Bitis nasicornis and Tropidolaemus wagleri juveniles are pretty neat
I guess I haven't seen all of those with my own eyes but I am drawing a blank on more blue snakes.
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