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Photo: Ian Dugdale (iNaturalist) · CC BY 4.0 (May be cropped or resized)
Acrochordus javanicus
Range
Borneo, Java, Sumatra and neighbouring islands
The elephant trunk snake, or Javan file snake, is a snake of the family Acrochordidae, a family that represents a group of primitive non-venomous aquatic snakes. It has a wide, flat head with the nostrils on top of the snout, which gives it a certain resemblance to boas (Wikipedia, general species account).