The Oxus cobra contains what kind of ions for their venom to be active?
Caspian cobra The Caspian cobra ("Naja oxiana"), also called the Central Asian cobra, Oxus cobra or Russian cobra, a member of the family Elapidae found in Central Asia.
Rinkhals The rinkhals (Hemachatus haemachatus), also called the ringhals or ring-necked spitting cobra, is a species of venomous elapid found in parts of southern Africa. It is not a true cobra in that it does not belong to the genus "Naja", but instead belongs to the monotypic genus "Hemachatus". It is closely related to the true cobras.