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[instar]

Thats intresting stuff indeed. maybe its covered with rostrum scale because it dosent get as much use as other species. I.e. There diurnal arnt they? If so they'd be more sight/movement orientated, not seeking food in darkness when its cooler?? just a thought.
On the other hand i might be way off, might be because their natural diet (atleast bhp's) are other snakes (not as much radient body heat as mammalian prey???