Sri Lankan green vine snake (Ahaetulla prasina) binocular vision: arboreal ambush feeding?
5 Answers from travellers
The Oriental Whip Snake or Green Vine Snake (Ahaetulla prasina / Gas Mapila) is a slender, arboreal colubrid widely distributed across Sri Lankan wet and intermediate forests. Its most striking morphological adaptation is its pointed snout and horizontal keyhole-shaped pupils set within recessed orbital bones, providing exceptional binocular stereoscopic vision. This allows it to judge distances precisely when ambushing agile geckos and tree frogs across complex vine networks. It is mildly venomous with rear fangs, posing negligible danger to humans.
When threatened, it inflates its slender neck to reveal striking black-and-white skin webbing between body scales while opening its mouth wide.
Their brilliant emerald-green body color provides camouflage among waxy tea leaves and forest vines during morning hunting hours.
Tea estate workers frequently encounter vine snakes resting at eye level along tea bushes; wearing gloves prevents accidental startle strikes.
Ovoviviparous reproduction produces litters of slender live young born directly onto forest canopy branches.
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