The specific species is the keelback snake (Tropidonophis mairii). Freshwater snake is the name which they have listed as the common name on the signs at the enclosure with the scientific name below it.
The Keelback Snake no longer lives in this enclosure. It is now housed in a new tank, at the top of the first escalator just before the freshwater turtles. Luckily it is much more visible in this new tank, I never did see it in the old one. The old tank now houses a Green Tree Python and a juvenile turtle (don't know what species)
