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Night spotlighting for Sri Lankan Cat Snakes (Boiga ceylonensis): arboreal hunting behaviors?

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E
Evelyn•920 rep

What are the distinctive vertical pupil dilation and neck-splay threat displays of endemic mildly venomous cat snakes hunting sleeping geckos in wet-zone canopies?

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5 Answers from travellers

✓Accepted Answer

The Sri Lankan Cat Snake (Boiga ceylonensis / Nidi Mapila) is a nocturnal, rear-fanged (opisthoglyphous) colubrid specialized in hunting roosting birds and geckos. Field identifiers include an elongated head distinct from a slender neck, large copper eyes with vertical cat-like pupils, and a triangular cross-section body. When cornered, it loops its anterior body into an S-curve, flattens its head to mimic a venomous viper, and strikes repeatedly. Although its venom causes localized itching and mild swelling in humans, systemic envenomation is clinically absent.

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D
Dr Senaka•1950 rep

Spotlighting requires scanning thin branches 1 to 3 meters above forest streams; their golden-brown chevron markings stand out against dark rainforest leaves.

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E
Evelyn•920 rep

Local folklore incorrectly claims that Mapilas drop onto sleeping people from rafters in groups to suck blood, leading to harmless specimens being killed out of superstition.

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D
Dr Gamhewage•1850 rep

Carry a serpent hook if handling wild specimens for scientific photography; rear fangs can pierce delicate finger webbing if gripped carelessly.

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L
Lukas•915 rep

Field research involving snake capture requires formal scientific research permits issued by the Department of Wildlife Conservation in Battaramulla.

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R
Ranger Bandara•1740 rep

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