Sounds like somebody brought some souveniers back from South Africa.
The Cobra might have been the most feisty, but those mambas take a back seat to no serpent in its deadliness to man. They were juveniles, because they can get to 14 feet in length at adulthood.
If any snake would deserve the sobriquet, Terminator, it would be the Mambas.
...I've had kingsnakes as pets in the past. Indigenous to the US. There is a photo of a 5ft. kingsnake that swallowed a 6ft. rattlesnake. Pretty good. But, I wouldn't put the king up against some of the foreign species that are here. Any way, Good postin on yer...