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Nagini was a large, green snake, roughly twelve feet long and as thick as a man's thigh. In the movies, she is portrayed as a reticulated python, despite the fact that pythons are non-venomous and do not even have fangs.
There is no known species of venomous snake matching Nagini's description; therefore, she is most likely a species of snake found only in the magical world. This would also account for her unusually high level of intelligence, far beyond that of a normal snake. Another possibility for her mismatching description is that she was heavily modified by Voldemort's dark magic, granting her such venomous aspect, as most of his other horcruxes and even his own body had been.