In general the dwarf boa localities are known for being flightier or nippier than their larger cousins, especially as youngsters, though even my adult Tarahumaras will still take a swipe at me if I startle them. I think it's because the smaller snakes are prey for larger predators for a longer period of their lives (or all their lives), and as a result they are more likely to remain defensive than the ones that grow larger.
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