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Photo: Cheongweei Gan (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Sibynophis melanocephalus
Range
Thailand, Malaysia, Indonesia, Singapore and Vietnam
The black-headed collared snake, also called the Malayan many-toothed snake, is a nonvenomous colubrid snake found in Thailand, Malaysia, Indonesia, Singapore and Vietnam (Wikipedia, general species account).