I think the 10' ones are pretty exclusive to one end of the coastal range and are females. Most of the US CBB population is not from that end of their range, so it is common for US females to never exceed 8 or 9' and 7 or 8' on males. And the 9'/8' ones are exceptionally large. At least this is what I've been told by people who work with them.
But yeah, I think jungles typically max around 6'.
I don't see much on sex dimorphism on the other species, mostly in coastals, but there probably is some. A male jungle would probably stay well within that 6' size, but most of my research stayed on coastals, so definitely look at that yourself.
They definitely don't have particularly fragile tails. They're slender, so of course don't grab them tightly or pick up by it (like any snake really), but they're handle-able as babies. Unlike GTPs, they're only semi-arboreal.
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